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WorksheetsGrade 8 Science Mid-Year Review
Total questions: 47
Worksheet time: 1hrs 11mins
Which of the runner's accelerated during the race?
Runner A
Runner B
Runner C
Runner D
What is the net force on the object and which way would it move?
13 N to the LEFT
17 N to the RIGHT
0 N no movement
4 N to the LEFT
A student pushes against a wall with 20 N of Force and the wall does not move. In this case, the wall exerts _.
0N of force
20 N of force
More than 20 N of force
Less than 20 N of force
A scientist investigates the effect of carbon dioxide on plant height. The scientist grows plants in several closed containers. All the plants receive the same amounts of water and light, but the air in each container has a different amount of carbon dioxide. What is the independent variable in this experiment?
the amount of carbon dioxide in each container
the number of plants in each container
the amount of water provided to the plants
the height of each plant after a period of time
If you increase the amount of spinach you eat, then you will increase the iron in your blood.
What's the DEPENDENT variable in an experiment to test this hypothesis?
blood iron levels
increase in spinach eaten
decrease in spinach eaten
spinach iron levels
If I ride my bike to school instead of walking, then I will get to school faster. What is the INDEPENDENT variable?
school location
time it takes to get to school
walking to school
riding bike to school
What is the part of the experiment that does NOT have the INDEPENDENT variable applied and is used to gather data and make comparisons?
Independent Variable
Dependent Variable
Control Group
Experimental Group
In a controlled experiment, the variable that is changed to test the hypothesis is called the –
Controlled Variable
Responsive Variable
Dependent Variable
Independent Variable
A possible explanation to a question that can be tested is called a ____________.
hypothesis
data
theory
fact
To drag a sofa over carpet, movers sometimes use slippery pads. Which force is reduced with the use of the pads?
Friction
Gravity
Push
Magnetism
If the students study for my scientific method test, then they will have a better test score. What is the dependent variable?
Scientific Method
Studying
The students
Test score
Found in the (a) of the Earth , the picture illustrates (b) which are the slow rotation of the molten rock found in that layer of the Earth.
Which layer does seismic wave data confirm is plastic (semi-solid)?
crust
inner core
mantle
outer core
Four blocks were placed in water. Which is the least dense?
Purple
Red
Blue
Yellow
Which type of force resists motion?
Friction
Gravity
Pull
Push
How does the mass of an object affect the motion of an object?
The greater the mass the less effect a force will have
The greater the mass the greater the effect a force will have
The less the mass the less effect a force will have
It has no effect
Which type of seismic wave is shown in the diagram?
P wave
L wave
R wave
S wave
If two toy trucks are pushed with the same force, Which one will move the longest distance?
The one with more mass
The one with less mass
The mass will make no difference
What happens in a game of tug-a-war when both teams pull the rope with equal force and in opposite directions?
The rope does not move
Both teams move to the right
Both teams move to the left
Both teams fall down
Why does a newly oiled machine work faster than a machine that hasn't been oiled?
Oil reduces the friction between the parts
Oil increases the friction between the parts
Gravity acts more on an old machine
Gravity acts more on a new machine
What should you do to make a toy car roll faster down a ramp?
Push it with more force
Push it with less force
Remove the force of gravity
Use magnetism to push it down
Mass is the amount of __________ in an object
matter
weight
space
volume
Which of the following is a correct unit for mass?
mL
cm3
g/cm3
g
Which is more dense: a full block of wood, or a half block?
Full Block
Half Block
Density is the same for both.
Which liquid is least dense?
red
yellow
green
blue
Which of the three blocks has the greatest density?
A
B
C
Which of these layers does seismic wave data confirm is solid?
Inner core
Outercore
Mantle
What can we infer about the layers of this planet by looking at the P and S waves?
Layers 1 and 2 are solid.
Layer 1 is solid, Layer 2 is liquid
Layers 1 and 2 are liquid
Layer 1 is liquid, Layer 2 is solid
Which statement about seismic waves is accurate?
Seismic waves only result from earthquakes.
Seismic waves have uniform motion within Earth’s layers
Seismic waves change speed when density changes in Earth’s layers.
Seismic waves determine differences in temperature in Earth’s layers.
Which statement describes the heat that results from the radioactive decay of elements deep in Earth’s interior?
It originally came from our Sun.
It is the reason the inner core is solid.
It drives the convection currents in the mantle.
It heats the atmosphere and makes life possible.
What are the two sources of thermal energy in Earth’s interior? Pick 2
Solar Radiation
Gravity (from formation of Earth)
Radioactive Decay
Combustion (fire)
What is the correct order of Earth’s layers starting with the outermost (surface layer) at 1?
Lithosphere
Asthenosphere
Mesosphere
Outer Core
Inner Core
For every action there is an equal and ___________ reaction
same
opposite
larger
smaller
What happens when two forces act in the same direction?
the forces add together
the forces cancel each other out
the stronger force takes over
Air resistance is considered to be a type of:
motion
speed
friction
weight
The greater the mass an object has, the greater the inertia.
True
False
Which type of friction is pictured?
rolling
sliding
fluid
Which of the following would cause an increase in friction on our Hot Wheels ramp?
add cooking oil to the ramp
add sandpaper to the ramp
Which of the following is an example of Newton's 1st Law of Motion?
When you swim, you push the water backward and the water pushes you forward.
A soccer player races to the motionless soccer ball and kicks it to overcome inertia.
Which of the following is a source of heat in Earth's interior? Select 3.
gravity pulling dense material to the center
seismic waves
radioactive decay
solar radiation
heat left over from Earth forming
Which of the following statements summarizes the differentiation of Earth into layers?
the densest materials moved to the center.
the densest materials moved to the outside.
the densest materials formed the middle layer.
the densest materials were evenly distributed.
When S-waves reach the outer core of the Earth they stop and when P-waves reach the outer core of the Earth they slow down. What is the reason for this speed change?
The outer core is a solid and P-waves don't go through solids.
The outer core is a liquid and P-waves slow down in liquids and S-waves don't go through liquids.
The outer core is made of iron and S-waves don't go through iron and P-waves always slow down in iron.
The outer core is a putty-like material and S-waves don't go through putty and P-waves slow down in putty like material.
Which of the following is an hypothesis?
Seeds will germinate faster if soaked in bleach.
If bleach is applied to seeds then they will germinate faster.
Applying bleach to seeds will cause them to germinate faster.
If bleach is put on seeds they grow faster.
Gravity
The force that attracts
two objects with mass
toward each other.
Weight
A measure of the gravitational force between objects
Air Resistance
An opposing force against objects moving through the air
Force
A push or pull required to
move an object
Mass
The amount of matter contained in an object or substance
