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WorksheetsQuarter 1 EXAM Ultimate Study Questions- 8th Grade
Total questions: 117
Worksheet time: 2hrs 54mins
Kenny planned an investigation that would test the effects of exercise on heart rate. He asked five classmates to run around the school track. He measured their heart rates before and after they ran. The results of his experiment are shown in the table. Which conclusion is BEST supported by the data in the chart?
The amount of sweat each student produced increased based on how far they ran around the track.
The heart rate of a person exercising changed based on what foods they ate.
The age of a student determines how much their heart rate increases with exercise.
Exercise causes heart rate to increase but not the exact same amount for every person.
Students place soil from the playground in a stream table. They sprinkle water on the upper end and observe the result. The students repeat the same process using soil from other places around the school campus. Which question are the students trying to test?
Does the stream table's slope affect erosion?
Does soil type affect soil erosion?
Does the stream table length affect soil erosion?
Does the volume of water affect soil erosion?
James is investigating the germination of been seeds. He plants 30 bean seeds each in three identical square containers and plans to give the same amount of sunlight and water to each container in a different room, with each room at a different temperature. Which of these hypotheses is the MOST appropriate for this research project?
If the size of the container is smaller, then the number of seeds that germinate will increase.
If the temperature of the room is lower, then the number of seeds that germinates will decrease.
If the amount of water given to the seeds is higher, then the number of seeds that germinate is higher.
If the number of seeds planted in the container increased, then the the number of seeds that germinate will increase.
Students in Ms. Smith's class are testing the effects of light on the growth of mold of bread. They have 6 slices of bread they plan to leave on a classroom table and monitor for two weeks. They place 3 of the slices in brown paper bags that light cannot pass through. Which type of bag would they use for the other 3 pieces of bread, considering that they want to test the effects of light on the growth of mold?
a white paper bag
a black paper bag
a bag made of clear plastic
a bag made of aluminum foil
Two students are rolling marbles down a ramp and measuring how long they take to teach the bottom. They each have a bag containing marbles made of different materials that are also different sizes and colors. What can the students do to be sure their results can be replicated?
Make sure that they both use the same color marbles.
Make sure that they test the marbles at different times.
Be sure to sue marbles of the same size and material each time.
Be sure they guess how long the marbles will take to go down the ramp.
Lucas theorizes that changing the slope of a ramp will affect how far a toy car travels down the ramp. To test this theory, Lucas builds two ramps with different slopes. Lucas sends a toy car down each ramp one time. After measuring the distance watch toy car traveled, Lucas concludes that the sleeper slope caused the toy car to travel further. What would be the benefit of Lucas conducting multiple trials on each ramp?
Lucas would replicate the study.
Lucas would improve the validity of the results
Lucas would prove the hypothesis was correct.
Lucas would increase the accuracy of his measurements.
A scientist has just finished an experiment that produced new evidence showing how DNA works. She wants to ensure that the evidence is accepted by other scientists. Which action will MOST LIKELY prevent the evidence from being accepted?
Other scientists cannot replicate the results of her experiment in a similar lab.
Other scientists publish a similar experiment that supports the results of her experiment.
The scientist repeats her experiment ten more times and gets similar results.
The scientist compares her experiment to another experiment showing how hers is different.
How many meters were traveled between B & C?
0 meters
200 meters
800 meters
50 meters
The graph represents the motion of a boat traveling at a constant speed. If the boat continues traveling at the same speed, how far will it travel in 6 seconds?
8 meters
32 meters
40 meters
48 meters
Stanley watches his cat run across his living room. He obtains the following data on the graph. How would the graph be different if the cat walked across the living room?
the slope of the line would be steeper
the line would be curved
the line would be horizontal
the slope of the line would be less steep
The top three Chihuahuas in the annual Cinco de Mayo Chihuahua race were Lila, Rosalita, and Mandy. Using the graph below, what is the correct order of fastest to slowest?
Lila, Mandy, Rosalita
Mamdy, Lila, Rosalita
Rosalita, Lila, Mandy
Rosalita, Mandy, Lila
Jimmy rode his bicycle away from his house at a constant speed. Which of the following graphs best shows the relationship between the distance traveled and the time spent driving?
A toy car sits motionless at the top of a ramp. What will happen to the car if a balanced force acts upon it?
it will stay in place
it will roll backward
it will fall off the ramp
it will roll down the ramp
During a game of soccer, Jenny kicks a ball straight down the field. Her teammate Craig is waiting close by. He does not allow the call to stop, and kicks the ball straight down the field in the same direction. How does the ball move immediately after Craig kicks it?
it moves less rapidly in the same direction
it moves more rapidly in the opposite direction
it moves more rapidly in the same direction
it moves less rapidly in the opposite direction
A ball sits in the middle of the table without moving. What must happen for the ball to start moving?
The forces acting on the ball must be balanced.
The net force on the call must be zero.
The forces acting on the call must be unbalanced.
the ball must have overcome the force of gravity.
Which of these has an unbalanced force?
A book sitting undisturbed on a desk
a child standing in a line that is not moving
a meteoroid moving at a constant speed and direction through outer space
a ball that is slowing down as it rolls on the ground along a straight line
Look at the image. What would be the result of the two people pushing on the box?
The box will not move.
The box will move 5N to the left.
The box will move 15 N to the left.
The box will move 2N to the right.
Which of the following situations represents an unbalanced force?
Ashton stares at his textbook that is sitting on his desk.
Lexi watches a car maintaining a speed of 45 miles per hour.
Tori throws a paper airplane and it glides across the room.
Orion looks at his shiny penny resting at the bottom of a fountain.
The wind transfers energy to turbines as it turns the turbine blade. What type of energy do the turbine blades have while spinning?
chemical energy
potential energy
kinetic energy
light energy
Jerry tosses a ball into the air and watches it fall back to Earth. When does the ball have the greatest amount of potential energy?
at its highest point
as it leaves Jerry's hand
just before it hits the ground
halfway up top its highest point
Samantha wanted to ride a rollercoaster. The rollercoaster is shown in the picture. Which statement BEST describes the energy changes taking place as the rollercoaster moves from point B to C?
Both potential energy and kinetic energy increase.
Both potential energy and kinetic energy decrease.
Kinetic energy decreases and potential energy increases.
Potential energy decreases and kinetic energy increases.
Juan's room is suddenly dark when a light bulb burns out. He attempts to replace the old bulb with a new one but realizes that the old bulb is too hot to touch. Juan waits 10 minutes and then changes the bulb when it is completely cool. What happened to the heat in the bulb during the 10 minutes he waited?
The heat was completely destroyed.
The heat was stored as chemical energy.
The heat was transformed into electricity.
The heat was transferred to the air around it.
Metal springs are good examples of stored force and opposing force. If a force pushes a spring downward, compressing it tightly, what direction of force would the spring MOST LIKELY have in return?
it would twist
it would push upward
it would compress itself more tightly
it would push outward to either side
What is the best scientific definition of the term "force"?
A force is a push or pull that changes the motion of an object.
A force is an event that changes the appearance of an object.
A force is any object that can be changed by another object,
A force changes an object into another object.
Which phrase BEST describes a gravitational force?
a force that pulls objects toward each other
a force that can make objects both attract and repel each other
a force that spins objects
a force that acts only when two objects are in contact with each other
Curtis conducts an investigation to determine which brand of paper towels is most absorbent. He records his findings in the table. What is the test variable (independent variable) and outcome (dependent variable) in this investigation?
Test variable: brand of paper towels
Outcome: amount of water absorbed
Test variable: the liquid used
Outcome: amount of water absorbed
Test variable: the amount of water absorbed
Outcome: brand of paper towels
Test variable: the time the towels absorbed water
Outcome: brand of paper towels.
Simran is learning how to design an experiment to test a hypothesis. What is the most likely outcome of testing a hypotheses in controlled conditions?
avoiding dangerous conditions during experimentation
limiting the variables that that can affect the experiment
making the experiment easier to conduct
keeping the experimental area sterile
Caleb wants to know how salt affects the boiling point of water. What is the BEST way for Caleb to collect data to answer this question?
Bring 1 liter of water to a boil, then add 1 gram of salt and observe any changes.
Add 1 gram of salt to 1 liter of water and time how long it takes for the water to boil.
Add 1 gram of salt to 1 liter of water and leave a second liter free of salt; time how long it takes for each to boil.
Add 1 gram of salt to 1 liter of water and 10 grams of salt to a second liter; time how long it takes for each to boil.
Scientific investigations involve the collection of empirical evidence. Which of these statements is NOT true about empirical evidence?
Empirical evidence is influenced by personal feelings.
Empirical evidence can be collected by many scientists.
Empirical evidence is measurable.
Empirical evidence includes descriptive observations.
Scientific investigations involve the collection of empirical evidence. Which of the following is NOT as example of empirical evidence that could be gathered to investigate the idea that consuming more calories than you use results in weight gain?
measurement data of people's calorie intake and weight
interviewing people about changes in weight
measuring people's changes in weight
determining the caloric values of foods
Owen is reading a study about a mysterious medical syndrome in adults. He sees the chart below, which shows how test subjects and control group subjects scored for particular symptoms using a scale from 1 to 10, with 10 being the highest experience of a symptom. He knows that control subjects are a group of people that are not experiencing the syndrome. What is the importance of the control subjects?
You can use the scores of control subjects to figure out which symptoms seem to be associated with the disorder and which do not.
You can use the scores of control subjects to figure out that some of the control subjects also have the syndrome.
You can use the score of control subjects to figure out the exact disease that the test subjects are suffering from.
You can use the scores of the control subjects to figure out that the test subjects are exaggerating the symptoms.
The collection of evidence in support of scientific theories is an ongoing process. What effect will contradictory evidence have on a scientific theory?
The scientific theory will be modified to account for the new evidence.
The scientific theory will be discarded in light of the new evidence , and a new theory will take its place.
The scientific theory will not change, since the evidence was collected after the theory had been formulated.
The scientific theory will be discarded, with no replacement, and the line of investigation abandoned altogether.
Sir Isaac Newton developed the theory of universal gravitation. Albert Einstein studied Newton's theory and later developed his theory of general relativity, which is considered more accurate. Which statement BEST describes the relationship between Newton's and Einstein's theories?
Both theories are incorrect.
Newton is responsible for Einstein's theory.
Einstein's theory built upon Newton's theory.
Newton was not as good a scientist as Einstein.
An asteroid is flying through the space at a constant speed? Which statement below correctly describes the motion of the asteroid?
Each day, the asteroid travels farther than it did the previous day.
Each day, the asteroid travels the same distance it did the previous day.
Each day, the asteroid travels less than it did the previous day.
Each day, the asteroid travels the opposite direction of the previous day.
The graph below shows the motion of three joggers. Which of the following statements correctly describes the relationship between the joggers ?
Jogger Y is moving at a faster rate than jogger X.
Jogger Z is farther ahead than joggers X & Y.
Jogger X is moving at a faster rate than joggers Y & Z.
Jogger Z is slowing down while jogger X is moving at a constant speed.
Look closely at chart which shows mechanical energy of a car on a roller coaster at four different locations. Notice that the total energy, or mechanical energy, of the car on the rollercoaster is always the same. What explains this observation?
Kinetic energy is created during a rollercoaster ride.
Kinetic energy and potential energy change but energy is neither created nor destroyed during the rollercoaster ride.
Potential energy increases but kinetic energy stays the same during the rollercoaster ride.
Potential energy is destroyed during the rollercoaster ride.
Energy can be transformed from one type to another. In which of the following situations is kinetic energy transformed into potential energy?
when a boulder rolls down a mountain
when a water tank ruptures and water flows out
when a tree branch falls toward the ground
when a ball is thrown straight up into the air
The drawing below shows three different positions of a skier as she descends a snow-packed hill. Which of the following statements is correct?
At point A, the skier is experiencing no proaction, therefore all of her energy is kinetic.
The skier at point C is moving the fastest, and therefore has the most potential energy.
At point B, the skier's kinetic energy is higher than at point C.
Friction is reducing the amount of kinetic energy the skier has.
Which statement below explains the possibility for a distance versus-time graph to be a vertical line?
It is not possible.
When an object is moving at a constant speed.
When an object is not moving.
When an object is moving 2 meters per second.
Students place soil from the playground on a stream table. They sprinkle water on the upper end and observe the results. The students repeat the same process using different soil from other places around the school campus.
Which questions are the students trying to test?
Does the stream table slope affect soil erosion?
Does the soil type affect soil erosion?
Does stream table length affect soil erosion?
Does volume of water affect soil erosion?
A student examines the effect of the number of D batteries in an electrical circuit on the brightness of a light bulb. In the experiment, circuits were built with 1, 2, 3, and 4 batteries. For each test, the brightness of the light bulb was measured using a light meter.
Which factor should the student keep constant?
the type of batteries
the number of D batteries
the brightness of the light bulb
the data collected from the light meter
How do replication and repeated trials compare?
During both processes, the original investigator does the experiment again.
During both process, a different investigator does the experiment again.
During replication, a different investigator does the experiment again. During repeated trials, the original investigator does the experiment again.
During replication, the original investigator does the experiment again. During repeated trials, a different investigator does the experiment again.
Scientists study changes in beaches, marshes, and other coastal areas. The movement of water causes coastal areas to change.
Which of these is NOT a source of evidence for studying coastal areas.
data of waves and tides
information on the size and shape of beaches
maps of hurricane paths in the past 10 years
surveys that ask peoples their opinions of beaches
Cicadas are insects that spend most of their lives developing underground, then emerge after a period of time. As part of their life cycle, cicadas molt and leave behind a shell, or exoskeleton, on tree trunks and shrubs.
How could a student use empirical evidence to determine the population of cicadas in the area?
The student could watch a video of insects in the wild.
The student could take a poll to find how many people have heard about cicadas.
The student could count the number of cicada shells left behind over a period of time.
The student could predict how many cicada shells would be collected in a particular forest area.
Which of the following is an example of pseudoscience?
Studying how the Moon creates tides.
Studying how acid rain forms.
Studying whether your birth month affects your personality.
Studying whether beak size determines the diet of certain birds.
A student keeps a science journal and records the conditions of her classroom. Every day when she enters the room, she writes down an observation under one of four observation categories.
Which of the following four observation categories are based on empirical evidence in the forms of quantitative data?
the number of students present
whether the room feels warm or cold to her
the color of the teacher's tie
whether she thinks the room is neat or messy
Some models are better suited to represent a certain system than others. Which is NOT a factor in evaluating the usefulness of a model?
simple and easy to understand
fits the data and explains the phenomenon
allows researchers to make accurate predictions
the number of researchers using the same model
John Dalton's atomic theory stated that all atoms of a given element are identical in mass and properties. More than one hundred years later, scientists learned that atoms of the same element could have different masses.
What does this illustrate about scientific theories?
Scientific theories are modified over time as new evidence is discovered.
Scientific theories are only guesses, which are by definition inaccurate.
Scientific theories are only guesses, which are by definition inaccurate.
Theories that have been revised are completely correct and will not be changed in the future.
The school board for a city in Florida wants to take steps to make school lunches healthier and more appetizing to students. What is the BEST way for scientists to help the school board make decisions about this issue?
Scientists could research which foods are available in recyclable containers.
Scientists could research which foods are least expensive and easy to prepare.
Scientists could research which foods are nutritious and popular among students.
Scientists could research which foods are most popular among parents of students.
Remember that speed= distance / time. If an object is moving at a constant speed of 3 meters/second, how far will this object travel in 4 seconds?
6 meters
9 meters
12 meters
15 meters
A marine biologist observed the swimming speed of five different types of fish as shown in the chart below.
What measurements did the marine biologist take to correctly calculate the speed of these fish?
time and density
volume and mass
distance and time
distance and density
The graph represents the motion of a boat traveling at a constant speed.
If the boat continues traveling at the same speed, how far will it travel in 6 seconds?
8 meters
32 meters
40 meters
48 meters
Stanley watches his cat run across his living room. He obtains the following data represented by the graph.
How would the graph be different if the cat walked across the living room?
the slope of the line would be steeper
the line would be curved
the line would be horizontal
the slope of the line would be less steep.
Force can change the speed or direction of motion of an object, or sometimes both. The illustration below shows a game of tug-of-war between two teams of students.
The team of students on the right won the contest. What force helped the winning team?
a balanced force
an electrical force
an unbalanced force
gravitational force
Which of these has an unbalanced force?
a book sitting undisturbed on a desk
a child standing in a line that is not moving
a meteoroid moving at a constant speed and direction through outer space
A ball that is slowing down as it rolls on the ground along a straight line
A ball sits in the middle of a table without moving. What must happen for the ball to start moving?
The forces acting on the ball must be balanced.
The net force on the ball must be zero.
The forces acting on the ball must be unbalanced.
The ball must have to overcome the force of gravity.
The drawing shows the cars of a roller coaster racing down the track.
How does the Law of Conservation of Energy best explain the energy of the cars on the track?
The kinetic energy of the cars is being transformed into potential energy.
The cars have potential energy, but no kinetic energy.
The potential energy of the cars is being transformed into kinetic energy.
The cars have kinetic energy, but no potential energy.
The law of conservation of energy describes a key characteristic of energy and the way it is transformed within systems. Which expression BEST demonstrates the law of conservation of energy?
gravitational potential energy = weight x height
density = mass/volume
force = mass x acceleration
mechanical energy = potential + kinetic
Jerry tosses a ball into the air and watches it fall back to Earth.
When does the ball have the greatest amount of potential energy?
at its highest point
as it leaves Jerry's hand
Just before it hits the ground
halfway up to its highest point
Some space missions are carried out with no human crew members on board. What is the reason why some space missions have no human crew?
Some parts of space have too much oxygen for human crews.
Some parts of space are not interesting to humans.
There are many parts of space to which humans have already traveled; they do not need to go again.
Distances in space are so vast, some missions take too long to include humans.
The wind transfers energy to turbines as it turns the turbine blades.
What type of energy do the turbine blades have while they are spinning?
chemical energy
potential energy
kinetic energy
light energy
Which of the following statements is true regarding mass and weight?
Mass is dependent upon force while weight is dependent on the amount of matter in an object.
Mass and weight will always be equal.
Mass is is dependent on the amount of matter in an object while weight is dependent upon force.
Mass and weight both change as gravity changes.
On Mars an object weighs approximately 40% what it weighs on Earth, how is the mass of an object different on Mars than it is on Earth?
The object's mass is the same as it is on earth.
The object's mass is greater than it is on earth.
The object's mass is less than it is on earth.
The object's mass changes proportionally with its weight.
If an astronaut travels from Earth to the Moon, which of the following would change?
weight
mass
volume
density
Physical properties can be uses to describe objects. Changing which of the following properties would also affect the gravitational force?
color
hardness
mass
volume
Samina reports that 50 milliliters (mL) of unpeopled popcorn kernels has a mass of 200 grams (g). What is the density of the popcorn kernels?
2.5 g/mL
4 g/mL
10 g/mL
150 g/mL
The mass of a rock is measured with a balance. The rock is then broken into many smaller pieces and the total mass of all the pieces is measured again. Which of the following sentences about the mass is TRUE?
The mass of the rock will be greater than the total mass of the smaller pieces.
The mass of the rock will be less than the total mass of the smaller pieces.
The mass of the rock will be same as the total mass of the smaller pieces.
The mass of the rock will not be the same as the total mass of the smaller pieces.
Force can change the speed or direction of motion of an object, or sometimes both. The illustration shows a game of tug-of-war between two teams of students. The team of students on the right won the contest. What force helped the winning team?
a balanced force
an electrical force
an unbalanced force
a gravitational force
The forces acting on an object can either be balanced or unbalanced. If an unbalanced force is applied to an object, what might happen to the object?
Only the speed of the object might change
Only the direction of the object might change
Both the speed and direction of the object might change
Neither the speed or direction of the object might change
During the car ride home from school, Peter explained to his father what he learned about motion in class that day. He predicted to his father that they would experience negative acceleration before they arrived home. When did Peter and his father experience NEGATIVE acceleration?
When they filled the car up with gas
When they passed another car
When they drove out of the school parking lot onto the road
When they approached a stop sign
Rina’s mother asked her to help move some items from the hall closet to the garage. One item she wanted to move was a large box of old school books. Rina tried to lift the box, but could not pick it up. What force was Rina NOT able to overcome?
frictional force
electrical force
gravitational force
magnetic force
Jorge was riding in the car with his family. Suddenly Jorge shouted out “We just experienced an unbalanced force!” When did Jorge shout this out?
when their car’s engine started
when their car was passed by another car, while traveling at a constant speed
when their car slowed down for a red light
when their car kept on traveling straight along the highway at a constant speed
Melinda is preparing to perform an experiment to test how an unbalanced force affects an object. She plans to use a hair dryer to blow air on a ping pong ball. What two variables should she measure in this experiment?
force and mass
direction and time
mass and speed
speed and direction
Two students, Priscilla and Devin, are pulling as hard as they can against one another at either end of the rope. Their friend Rod walks by and says they are pulling equally hard. How does he know?
The rope is making waves.
Devin is getting rope burn.
Priscilla and Devin are not moving.
Priscilla is sliding at a constant rate.
A marine biologist observed the swimming speed of five different types of fish as shown in the chart. What measurements did the marine biologist take to correctly calculate the speed of these fish?
time and density
volume and mass
distance and time
distance and density
Kareem set up the materials shown in the illustration as part of an experiment involving friction. What two instruments will Kareem need to calculate the speed of the book as it slides down the ramp?
metric ruler and balance
metric ruler and stopwatch
balance and stopwatch
magnifying lens and metric ruler
The graph plots the distance in kilometers traveled by an object over time in hours. What can you conclude from this graph?
The speed of the moving object remains constant.
The speed of the moving object increases over time.
The speed of the moving object decreases over time.
The speed of the moving object first increases and then decreases.
Mary performed an experiment on motion using a toy car and created a graph to plot the data. What units should Mary use on her graph to show the constant speed of the toy car over a certain distance?
grams and minutes
meters and seconds
minutes and hours
meters and centimeters
Look at the illustration of a block sitting on a table-top. The magnified view illustrates a force that exists between the two objects. Which type of force is demonstrated in the magnified view?
electrical force
frictional force
magnetic force
no force
The graph shows the distance vs time data for two objects. Which statement represents an accurate conclusion that can be drawn from the graph?
Objects A and B moved in the same direction.
Object A moved at a constant speed while Object B’s speed changed as it moved.
Object A moved faster than Object B.
Objects A and B moved in straight lines.
While measuring the distance his toy car traveled during certain time periods, Manuel recorded the following data on the graph. Which of the following gives the time period when the speed of the car was fastest?
from 0 to 6 seconds
from 6 to 12 seconds
from 12 to 20 seconds
from 20 to 25 seconds
The drawing shows the cars of a roller coaster racing down the track. How does the Law of Conservation of Energy BEST explain the energy of the cars on the track?
The kinetic energy of the cars is being transformed into potential energy.
The cars have potential energy, but no kinetic energy.
The potential energy of the cars is being transformed into kinetic energy.
The cars have kinetic energy, but no potential energy.
As shown in the diagram, a 10 kg block starts from rest at point A and slides along a track past point B to point C. Which of the following is a correct statement about the potential energy of the block?
it will be zero at point C
it will be greatest at point B
it will decrease as it moves from point B to C
it will be greatest at point A
Energy can occur in many forms. Which of the following terms BEST describes kinetic energy?
motion
length
height
volume
A high-speed collision between two vehicles causes more damage than a low-speed collision. What is the reason for this?
Vehicles traveling at a high speed have no potential energy.
Vehicles traveling at a low speed have no potential energy
Vehicles traveling at a high speed have more kinetic energy than vehicles traveling at lower speeds.
Vehicles traveling at a low speed have more kinetic energy than vehicles traveling at higher speeds.
Energy can be transformed from one type to another. In which of the following situations is kinetic energy transformed into potential energy?
when a boulder rolls down a mountain
when a water tank ruptures and water flows out
when a tree branch falls toward the ground
when a ball is thrown straight up into the air
Federica loves both science and baseball. When her father took her to a baseball game, she observed many examples of energy and energy transformation during the game. Which of these statements describes an example of kinetic energy that Frederica saw during the game?
Frederica’s favorite player sitting in the dugout.
Frederica’s favorite player running in the outfield to make a spectacular catch.
Frederica’s favorite player standing at home plate ready to hit.
Frederica’s favorite pitcher watching an outfielder catch a flyball.
The below shows what happened when a balloon touched a girl’s hair. Which type of force caused the girl’s hair to cling to the balloon?
gravitational force
electrical force
magnetic force
frictional force
Marissa wants to know which of four routes that she could possibly take on her walk to school is the fastest. Which of the following is the BEST way for Marissa to gather information to answer this question?
She should look on a map to see which route looks shortest.
She should walk each route herself at a normal pace and time how long each takes.
She should take a survey of her friends to find out what they think is the fastest route.
She should have four friends each take one route and observe who arrives at school first.
Sam developed the following hypothesis for his science project: The speed of a skateboard rolling downhill is greater on steep hills than on flatter hills. How can SamBEST test this hypothesis?
Push the skateboard with varying force down inclines set at different angles and measure the force with which the skateboard hits the wall.
Push the skateboard with varying force down inclines set at different angles and measure the distance traveled each time.
Roll the skateboard down a single incline, and measure the force with which it hits the wall.
Roll the skateboard down inclines set at different angles, and measure the time it takes to roll the same distance each time.
Scientific investigations have certain standards, including the ability to be replicated. Why should scientists be able to replicate an investigation?
A scientist might need to conduct multiple trials to ensure that results are accurate.
Other scientists need to verify the results.
Other scientists need to review the method by which results were communicated.
Replicating an investigation proves that the hypothesis was correct.
Sasha keeps her pet snake in an aquarium. Sasha has just completed an investigation to test how the strength of the light bulb she uses in the aquarium affects how much the snake eats. Which of the following procedures would be a repetition of Sasha’s investigation?
Sasha repeats the investigation following the same steps as her initial investigation.
Sasha repeats the investigation using stronger light bulbs.
Sasha repeats the investigation using an additional snake in the cage.
Marcus repeats the investigation following the same steps as Sasha’s initial investigation.
1What is the independent variable in the data table?
The number of trials
The number of chirps
The number of crickets
The temperature
What conclusion can be drawn using the data from the chart?
If crickets are subjected to higher temperatures then the number of chirps per minute will increase.
If crickets are subjected to higher temperatures then the number of chirps per minute will decrease.
If crickets are subjected to the same temperatures then the number of chirps per minute will increase.
If crickets are subjected to lower temperatures then the number of chirps per minute will increase.
3. What evidence supports the claim that the higher the temperature, the greater the number of chirps?
At 25°C the average number of chirps per minute was 83, compared to 127 chirps at 20°C and 168 chirps at 15°C.
At 25°C the average number of chirps per minute was 168, compared to 127 chirps at 20°C and 83 chirps at 15°C.
At 25°C the average number of chirps per minute was 127, compared to 83 chirps at 20°C and 168 chirps at 15°C.
At 25°C the average number of chirps per minute was 91, compared to 135 chirps at 20°C and 180 chirps at 15°C.
Which of the following examples shows an experiment that has been designed and conducted using repeated trials and replication? (8.N.1.2)
Addison is conducting an experiment using water. She has a friend look over the procedures before completing 30 trials.
Amanda is conducting an experiment using aluminum foil. She completes her experiment 1 time and makes adjustments to her procedures. She then completes 20 trials of her experiment.
Rashawn is conducting an experiment using tennis balls. He completes 30 trials and has 2 of his friends complete the experiment by following the his procedures.
Julian is conducting an experiment using rubber bands. He completes 10 trials then begins work on a different experiment.
Which of the following shows repeated trials in an experiment but does NOT show replication? (8.N.1.2)
Samuel writes his own procedures and then has a friend complete 20 trials.
Leslie writes her own procedures for her group to follow.
Joshua conducts an experiment by following the procedures given to him by his teacher.
Katelyn conducts an experiment that requires her to throw an object at a target 20 times.
What happens when an unbalanced force acts on an object?
The force must be greater than the reaction force.
The force is equal to the weight of the object.
The motion of the object changes.
The motion of the object does not change.
A ball is tossed into the air. Which of the following statements about the ball is the BEST example of the Law of Conservation of Energy?
The ball has less total energy at Y than at W.
The ball has more kinetic energy at X than at Z.
The ball has more potential energy at Z than at X.
The ball has the same amount of total energy at W as at X.
During field day, team E and G combine to compete against team F and H. What conditions would be necessary in order for teams F and H to win? (6.P.13.3)
One person on team E and G falls down and their team loses a force 112 N.
One person on team E and G falls down and their team loses a force of 100 N.
One person on team F and H pulls harder with an additional force of 75 N.
Two people on team F and H pull harder with an additional force of 50 N each.
Which of the following demonstrates an unbalanced force? (6.P.13.3)
A dog pushes its dog dish to the left with a force of 4 N. A cat pushes it to the right with a force of 4 N.
A child pushes a toy car to the left with a force of 3 N. Their parent pushes the same toy car to the right with a force of 3 N.
A woman pushes a bike to the right with a force of 10 N. Another woman pushes the same bike to the left with a force of 10 N.
A man pushes a desk to the right with a force of 16 N. Another man pushes the same desk to the left with a force of 10 N.
Which of these is an example of kinetic energy converting into potential energy?
a bicyclist coasting down a long hill
a car engine moving the car forward
a roller coaster car moving toward the top of a rise in the tracks
a thrown ball falling toward the ground after passing through the top part of its motion
Anne and Juan rolled four different objects down a ramp. They measured the distance each object rolled and the time until each object came to a stop. They plotted each point and connected it with a line from origin of the graph. Which object has the GREATEST average speed?
object A
object B
object C
object D
Which type of force can act only when two objects touch each other?
frictional
electrical
magnetic
gravitational
After walking across a carpeted floor in socks, Jim brings his finger near a metal doorknob and receives a shock. What does this demonstrate?
Frictional forces require direct contact.
Electrical forces require direct contact.
Electrical forces can act at a distance.
Frictional forces can act a distance.
Jupiter has about 317 times more mass than Earth. What can you infer from this fact?
That Jupiter’s gravitational force is much weaker than on Earth’s gravitational force.
That Jupiter’s gravitational force is much stronger than Earth’s gravitational force.
That Jupiter’s and Earth’s gravitational forces are equal.
Mass has no effect on the gravitational force between two objects.
Which of the following examples demonstrates replication?
Joseph conducts his own experiment 25 times.
Sarah is following another student's written procedures for an experiment that was already performed.
Juanita conducts her experiment 1 time.
Matt writes the procedures of his experiment carefully and carries out his experiment.
The graph shoes Tom's morning routine. Which of the following scenarios BEST describes the graph?
Tom went for a jog. at the end of his road he bumped into a friend and his pace slowed. When Tom left his friend he walked quickly back home.
Tom rode his bike east from his home up a steep hill. After a while, the slope eased off. Once down the top, he raced down the other side.
Tom jogged up a steep hill then went up a slight incline before jogging back down the other side.
Tom took his dog for a walk to the park. He set off slowly and then increased his pace. At the park Tom turned around and walked slowly back home.
Multiple forces can act on the same object at the same time. When will two forces acting on the same object result in an unbalanced force on that object?
when the two forces cancel each other
when the two forces produce a net force of 0 N
when the two forces apply different forces from opposite directions
when the two forces apply the same amount of force from opposite directions
Look closely at the illustration, which shows two groups of particles moving at different speeds. Which statement correctly describes the energy of the particles in the illustration?
The particles on the right have more kinetic energy than the particles on the left.
The particles on the left have more kinetic energy than the particles on the right.
None of the particles have kinetic energy.
None of the particles have potential energy.
What happens when an object is moved against gravity, such as a rolling toy up a ramp?
Kinetic energy does not change.
Potential energy does not change.
Potential energy decreases as it is transformed into kinetic energy.
Kinetic energy is transformed into potential energy.
Hassim set up the apparatus shown in the illustration. Hassim noticed that the object did not roll down the ramp. What force was responsible for keeping the object from moving down the ramp?
electrical force
magnetic force
gravitational force
unbalanced force
There are many types of forces. Which statement BEST compares an electrical force to gravitational force?
Electrical forces depend on the type of charge and gravitational forces depend on the mass of the objects and how far apart they are.
Electrical forces hold small objects near each other and gravitational forces hold large objects near each other.
Electrical forces are attractions between similar types of charges and gravitational forces are attractions between similar sizes of objects.
Electrical forces require that the objects are in contact with each other and gravitational forces require that objects are far from each other.
A specific kind of force will result on an object when it is pushed from opposite sides. What must be true if the force on this object is unbalanced?
The push must be equal in force on each side.
The push must be greater on one side than on the other.
Both pushes must apply a zero net force on the object.
Both pushes must produce a net force so that the object remains in place.
Which situation BEST describes what is happening in the graph?
A man is driving a car and increases his speed for 5 seconds. He stops and changes his direction and decreases his speed for 1 second until stopping.
A man is walking at a constant speed for 5 seconds. He then stops for 1 second and before continuing at a constant speed for 1 second. He then stops.
A woman on a bike is moving at a constant speed. She then stops for 1 second before continuing at a constant speed for 3 seconds. She then changes direction on her path and moves at a constant speed.
A woman is running for 2 seconds. She increases her speed at 2 seconds. She moves at a constant speed for 3 seconds. She stops for 1 second.
Miranda tested five brands of bubble gum to determine which brand she could blow the biggest bubbles. After testing each brand, she asked three friends to also do the tests to see if they got the same results. Asking her friends to help is an example of the following?
repeated trials
prediction
conclusion
replication
Michaela wants to know which brand of rechargeable battery lasts the longest. She buys four batteries made by different companies. She then puts the batteries into four identical flashlights and turns them on. She checks on the flashlights twice a day and records how long it takes for each flashlight to go out. Which of the following procedures would be a repeated trial of Michaela's investigation?
Michaela runs the trial again, using a toy instead of a flashlight.
Michaela runs the whole trial, without changes, two more times.
Michaela's friend runs the whole trial, without changes, two more times.
Michaela runs the trial again, changing her hypothesis so it will be supported.
