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Science 8 Semester 1 Final Exam Practice Questions 2022-2023

Total questions: 76

Worksheet time: 40mins

Name
Class
Date
1.
Experiment: Roberto and Tate dropped objects from a third-story window. They measured the time, in seconds, it took each object to reach the ground. The data they collected is shown here. The time required for each object to reach the ground is __________ in this experiment.
a)
dependent variable
b)
independent variable
c)
the hypothesis
d)
a constant or controlled variable
2.
Experiment: Roberto and Tate dropped objects from a third-story window. They measured the time, in seconds, it took each object to reach the ground. The data they collected is shown here. Based on this experiment, what is the independent variable?
a)
time
b)
type of object
c)
where object was dropped from
d)
the color of the object
3.
Experiment: Lidia collected the data shown here during an experiment in which she used the same amount of force to put each marble in motion. Based upon the information shown in the chart, which best describes the purpose of Lidia’s experiment?
a)
to determine the effect of mass on the distance a marble will move across a flat surface
b)
to determine the effect of mass on how much time a marble will travel before stopping
c)
to determine the effect of mass on the speed of a marble rolling across a flat surface
d)
to determine the effect of mass on the direction of a marble rolling across a flat surface
4.
When two objects are in contact, what force always works against the motion?
a)
friction
b)
gravity
c)
electrostatic
d)
magnetic
5.
If a book remains motionless on a table, the forces on the book are ...
a)
strong
b)
weak
c)
unbalanced
d)
balanced
6.
What is the net force acting on the ball?
a)
6 N to the right
b)
2 N to the left
c)
4 N to the right
d)
4 N to the left
7.
According to Newton’s third law of motion, when a hammer strikes and exerts force on a nail, the nail ...
a)
creates friction with the hammer
b)
disappears into the wood
c)
exerts an equal force back on the hammer
d)
moves at a constant speed
8.
The table below lists examples of everyday situations. Which situation correctly identifies the action and reaction forces involved?
a)
Option a
b)
Option b
c)
Option c
d)
Option d
9.
Balanced forces acting on an object ...
a)
always change the object's motion
b)
sometimes change the object's motion
c)
never change the object's motion
d)
are not related to motion
10.
The greater the mass of an object ...
a)
the easier the object starts moving
b)
the greater its inertia
c)
the more balanced it is
d)
the more space it takes up
11.
If an object is traveling at a constant velocity ...
a)
the forces acting on the object must be balanced.
b)
the forces acting on the object are unbalanced.
c)
there is a net force greater than zero.
d)
there is a net force less than zero.
12.
If a constant force of 20 N is applied to a 40 kg object, what is the object’s acceleration? (Formula: F= m x a)
a)
.5 m/s2
b)
2 m/s2
c)
20 m/s2
d)
60 m/s2
13.
A speedboat pulls a 55-kg water-skier. The force causes the skier to accelerate at 2.0 m/s2. Calculate the net force that causes this acceleration. (Formula: F= m x a)
a)
28 N
b)
53 N
c)
57 N
d)
110 N
14.
Along with its inertia, the force that is keeping the moon in orbit around the Earth is ...
a)
magnetic force
b)
electrostatic force
c)
gravitational force
d)
frictional force
15.
What will happen to the gravitational force when a meteor approaches Earth ...
a)
the gravitational force between the meteor and Earth decreases.
b)
the gravitational force between the meteor and Earth increases.
c)
the gravitational force between the meteor and Earth remains the same.
d)
there is no gravitational force between the meteor and Earth.
16.
The measure of the force of gravity on a person or object at the surface of a planet is known as
a)
mass
b)
inertia
c)
air resistance
d)
weight
17.
A train that travels 100 kilometers in 4 hours is traveling at what average speed? (Formula: S = D/T)
a)
50 km/h
b)
100 km/h
c)
2 km/h
d)
25 km/h
18.
If a bicyclist travels 30 kilometers in two hours, her average speed is ... (Formula: S = D/T)
a)
30 km/h
b)
60 km/h
c)
15 km/h
d)
2 km/h
19.
The moon is considered to be accelerating because it is ...
a)
in a vacuum in space.
b)
continuously changing direction.
c)
a very large sphere.
d)
constantly increasing its speed of orbit.
20.
If an object moves in the same direction and at a constant speed for 4 hours, which of the following is true?
a)
The object’s speed changed during the 4 hours
b)
The object’s velocity did not change.
c)
The object accelerated during the 4 hours.
d)
The object decelerated during the 4 hours.
21.
When you know both the speed and direction of an object’s motion, you know the ...
a)
average speed of the object.
b)
acceleration of the object.
c)
distance the object has traveled.
d)
velocity of the object.
22.
The rate at which velocity changes is called ...
a)
speed
b)
direction
c)
acceleration
d)
motion
23.
Acceleration can be defined as ...
a)
speeding up
b)
slowing down
c)
changing direction
d)
all of the above
24.
A roller coaster is moving at 10 m/s at the top of hill and 25 m/s at the bottom of the hill 3 seconds later. The average acceleration of the roller coaster is ... (Formula: A = (V2-V1)/T)
a)
2 m/s2
b)
3 m/s2
c)
4 m/s2
d)
5 m/s2
25.
A bicycle moving at 9 m/s comes to rest 3 seconds later. What is the average acceleration of the bicycle? (Formula: A = (V2-V1)/T)
a)
-6 m/s2
b)
-3 m/s2
c)
3 m/s2
d)
6 m/s2
26.
According to the graph in figure A, for each planet, as the object’s mass increases, the object’s weight:
a)

increases only

b)

decreases only

c)

varies, but with no general trend

d)

remains the same

27.
Consider the weight of a 100 kg object on Earth, on Mars, and on Jupiter. Based on the graph in Figure A, what is the correct ranking of the 3 planets on the basis of the object’s weight, from the planet on which the object would weigh the most to the planet on which the object would weigh the least.
a)

Mars, Earth, Jupiter

b)

Mars, Jupiter, Earth

c)

Jupiter, Earth, Mars

d)

Jupiter, Mars, Earth

28.
A particular object weighs 500 N on Earth. Based on the graph in Figure A, approximately how much more would the same object weigh on Jupiter? (Formula: Jupiter weight - Earth weight)
a)

The object would weigh the same on both planets.

b)

The object would weigh 200 N more on Jupiter.

c)

The object would weigh 700 N more on Jupiter.

d)

The object would weigh 1000 N more on Jupiter.

29.
Two girls are pulling on opposite ends of a thick rope. Both girls pull on the rope with the same force but in opposite directions. If both girls continue to pull with the same force, what will most likely happen? 
a)
One girl will pull the other toward her.
b)
Both girls will stay in the same place. 
c)
Gravity will cause the rope to sag. 
d)
The rope will break.
30.
A student walking quickly while carrying an orange on his lunch tray stops suddenly. The orange will most likely roll off the tray due to
a)
inertia of the orange. 
b)
centripetal force of the orange
c)
the friction acting on the orange.
d)
the balanced forces acting on the orange.
31.
 Alesia is taking an all­ day ride on her bicycle. The graph shows how far she is from home at different times during her ride.  During which time period is Alesia moving fastest?
a)
0–1 hours 
b)
3–4 hours 
c)
4–5 hours
d)
6–7 hours 
32.
Angela blows air into a balloon and holds the end of it closed with her fingers. When she lets go of the end of the balloon, Angela observes that the release of the air propels the balloon.  The propelling of the balloon from the release of the air is an example of which of Newton’s laws? 
a)
The force of an object is the product of its mass multiplied by its acceleration. 
b)
 A force of attraction exists between any two objects with mass. 
c)
 For every action, there is an equal and opposite reaction.
d)
An object in motion tends to stay in motion unless an unbalanced force acts upon it. 
33.
When a bird flies, its wings push air downward. As a result the air pushes back upward on the bird. Which law of motion most applies to the way the wings of a bird beat? 
a)
Every action has an equal and opposite reaction
b)
The rate of acceleration of an object depends on the amount of force applied.
c)
Objects in motion tend to remain in motion until acted upon by an another force. 
d)
Force is defined by mass times acceleration
34.
The graph shows the motion of four cars. All four cars are moving east.   
Which car has a constant velocity? 
a)
1
b)
2
c)
3
d)
4
35.
A student reads his paper on friction to the class. Which statement should he include in his paper if he wants to present accurate information? 
a)
Friction increases mechanical advantage
b)
Friction opposes the direction of movement. 
c)
Friction makes movement of an object easier.
d)
Friction reduces the amount of work used to move an object. 
36.
What is speed?
a)
Speed is how far something travels in one hour.
b)
Speed is how fast it takes something to travel a set distance
c)
Speed is the distance something travels in a set amount of time.
d)
Speed is the change in velocity of something.
37.
When an object's distance from another object is changing, the object is .... 
a)
under pressure.
b)
 in motion
c)
not moving.
d)
changing reference point.
38.
An airplane travels at 50 meters in 2 seconds. What is its average speed? 
a)
25 miles per hour
b)
100 miles per hour
c)
25 meters per second
d)
100 meters per second
39.
Which of the following is an example of acceleration?
a)
A book laying on a table
b)
An airplane moving at a constant speed of 500 mph in a straight line
c)
A race car going into a curve
d)
An object at rest
40.
 If an unbalanced force acts on a stationary object, the object will:.
a)
remain stationary
b)
move away from the force
c)
accelerate in the direction of the force
d)
accelerate in the opposite direction of the force
41.
If no force is being applied to a stationary object, the object will...
a)
remain stationary.
b)
accelerate in the direction of the force.
c)
move at a constant speed in the direction of the force.
d)
accelerate in the opposite direction of the force
42.
A helicopter ambulance flew from one hospital to another in a straight line. The pilot had to  change speed several times due to the presence of other aircraft. 
What was the average speed of the helicopter during the trip? 
a)
2.0 km/min 
b)
2.5 km/min
c)
4.0 km/min
d)
7.5 km/min
43.

The toy car and ramp seen above might be used to answer which testable question?

a)

A. What material is the ramp made of?

b)

B. Which toy car looks the best?

c)

C What effect does gravity have on a toy car?

d)

D. What metal makes the best toy cars?

44.

2. By changing the surface over which the car rolls from sandpaper to wax paper, you might be able to test the effect of what force?

a)

A. Magnetism

b)

B. Wind

c)

C. Wind

d)

D. Friction

45.

How might you test the strength of several different types of magnets?

a)

F. Submerge each magnet in water

b)

F. Submerge each magnet in acid

c)

H. Find the mass of each magnet

d)

J. Measure the attraction force of each magnet

46.

3. Which two tools below would be most useful in testing how the mass of an object can affect the distance it moves with a push?

a)

A. Spring scale and hot plate

b)

B. Balance and meter stick

c)

C. Graduated Cylinder and beaker

d)

D. Magnet and thermometer

47.

5. An experiment is conducted to measure the amount of force required to push a square cardboard box from one side of the room to the other side. What variable is likely to lessen the force required?

a)

A. Adding several heavy weights to the box

b)

B. Tipping the box onto its side

c)

C. Adding another box on top

d)

D. Placing the box onto a wheeled cart

48.

7. A ball is sitting loose in the moving wagon pictured below. If the wagon stops suddenly, the ball will

a)

A. stop immediately with the wagon

b)

B. roll forward in the wagon and fall off

c)

C. both the wagon and the ball will crash

d)

D. stay exactly where it is

49.

During an experiment, students applied an equal force to push each box pictured below. If they pushed all of the boxes on the same surface for same amount of time, which box will MOST LIKELY move the greatest distance?

a)

F. 30 kg

b)

G. 15 kg

c)

H. 150 kg

d)

J. 40 kg

50.

9. Some students were testing the effects of force on the motion of a water bottle. They set up the experiment picture above and rolled the full water bottle down both ramps. What question were the students most likely trying to answer?

a)

A. How does mass affect the distance a full water bottle will roll?

b)

B. How does friction affect the distance a full water bottle will roll?

c)

C. How does the size of the water bottle affect the distance it rolls?

d)

D. How does ramp height affect the distance a full water bottle will roll?

51.

10. A student investigating the effects of forces, measures the distance a ball can be pushed by air from a small fan. What is the dependent variable (change) in this investigation?

a)

F. The mass of the balls being pushed by air.

b)

G. The length of the surface on which the balls roll.

c)

H. The amount of wind pushing the balls.

d)

J. The type of surface the balls are rolling on.

52.
The variable that is being tested, counted, or measured and is responding to the independent variable is known as 
a)
Control
b)
Constant
c)
Independent Variable
d)
Dependent Variable
53.
The variable the is changed on purpose is..
a)
Constant
b)
Control
c)
Independent Variable
d)
Dependent Variable
54.

During a six week study, one tank of fish is fed once a day, one tank of fish is fed twice a day, and another tank of fish is fed four times a day. The fish's weight are recorded daily. What is the independent variable?

a)

amount of food

b)

weight

c)

type of fish

d)

number of fish in tank

55.

During a six week study, one tank of fish is fed once a day, one tank of fish is fed twice a day, and another tank of fish is fed four times a day. The fish's weight are recorded daily. What are the controlled variables?

a)

amount of food

b)

weight

c)

type of fish

d)

number of fish in tank

56.

One sunflower pot is watered with pure water and 3 others are watered with increasing concentrations of salt. The height of the sunflower is measured weekly. What is the independent variable in this experiment?

a)

Type of water

b)

Height of sunflower

c)

Amount of soil

d)

Amount of salt in water

57.

Three separate hives of bees were allowed to exit their hive and collect pollen at different times of day. At the end of the month, the amount of honey is measured. What is the dependent variable in this experiment?

a)

Time of day

b)

amount of honey

c)

Three different hives

d)

Amount of bees

58.

Gio wants to know if the size of the cookie influences how long it takes to bake. He places differing amounts of cookie dough on baking sheets and times how long the cookies take to brown. What is the independent variable?

a)

Time to bake

b)

Cookie dough size

c)

Oven rack

d)

Cookie sheet

59.
The things that are kept the same to ensure the results are due to the experiment is called..
a)
Control
b)
Constant
c)
Independent Variable
d)
Dependent Variable
60.
A study was done to see if different tire treads affect the braking distance of a car.
What is the dependent variable?
a)
Tire treads
b)
Braking distance
c)
Road conditions
d)
Model of car
61.
The higher the temperature in an oven, the faster a cake will bake.
What is the independent variable?
a)
Cake flavor
b)
Temperature
c)
Time
d)
Type of oven
62.

Different groups of 7th graders were timed on a math test. One group was allowed to use calculators and one was not. What was most likely being tested in this investigation?

a)

Battery life of the calculators

b)

If students knew how to use calculators

c)

If students with calculators could solve problems faster.

63.

Two students wanted to find out which of their different toy race cars would go the farthest. They let each car roll down a ramp and then measured how fast the car rolled. Which of these should be held constant if they want a fair test of their cars?

a)

Height of ramp

b)

Weight of ramp

c)

length of the cars

d)

shape of the cars

64.

A student wants to know whether giving dogs toys makes their tail wag more. He

gives a group of dog toys and one group of dogs he does not give toys. He counts how many times each group of dog tails wag in a given amount of time.

What is the dependent variable of this investigation?

a)

Dog toys vs no dog toys

b)

Number of tail wags

c)

Time

d)

Environment

65.

Nina believes that if she gives students peppermints during a test that they will perform better. During the next test she gives half the class peppermints and half the class she does not. What is the dependent variable?

a)

Peppermint or not

b)

Same combination of scored students

c)

test scores

d)

environment

66.

Which is needed to determine the amount of gravitational force between two objects?

a)

distance and mass

b)

weight and time

c)

area and weight

67.

The gravitational force exerted by an object depends on its

a)

volume

b)

mass

c)

weight

68.
Mass is a measurement of 
a)
how much matter is present in an object
b)
how much weight is present in an object
c)
the amount a spring is compressed on a scale
d)
none of the answers are correct
69.

as the mass of an object increases, the pull of gravity...

a)

Increases

b)

Decreases

c)

Stays the same

70.

Why do we have a stronger gravitational attraction with Earth than the Sun?

a)

the sun has a larger mass

b)

the Earth has a larger mass

c)

we are closer to center of sun

d)

we are closer to center of Earth

71.
What does the strength of gravity between two objects depend upon?
a)
Mass & distance
b)
Mass & weight
c)
Gravity & inertia
d)
Inertia & mass
72.

A student drops a bowling ball and an apple from a third-story window. Both objects hit the ground at the same time. From the experiment, the student should conclude that

a)

the apple weighs more than the bowling ball

b)

more air friction is acting on the apple than on the bowling ball

c)

gravity pulls on both objects, causing them to fall at the same time.

73.
Jupiter has about 317 times more mass than Earth. What can you infer from this fact? 
a)
That Jupiter’s gravitational force is much weaker than on Earth’s gravitational force.
b)
That Jupiter’s gravitational force is much stronger than Earth’s gravitational force.
c)
That Jupiter’s and Earth’s gravitational forces are equal.
d)
Mass has no effect on the gravitational force between two objects
74.
Which of these best describes why your weight (on Earth) would change on another planet?
a)
Dehydration effects on different planets change weight.
b)
In general, the smaller the planet, the greater weight
c)
Different planets have different gravitational pulls
d)
Weight does not change, no matter where you are.
75.

An astronaut way out in space is considered to be “weightless". This is because–

a)

his mass is so small relative to the earth that gravity doesn’t affect him.

b)

gravitational force decreases greatly over long distances.

c)

gravitational force pushes objects away from each other at long distances.

d)

objects far away from the earth have less mass.

76.

Which statement is true?

a)

All objects with mass exert a gravitational force.

b)

Only celestial objects exert a gravitational force.

c)

Gravity can both push and pull objects.

d)

Only Earth exerts a gravitational force.

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