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Worksheets8th grade Force & Motion Unit Review
Total questions: 27
Worksheet time: 14mins
Name
Class
Date
1.
1. How is this picture an example of Newton's 3rd Law?
a)
The rocket is in motion so it will stay in motion until actced upon by an unbalanced force
b)
the "Action" is the burning of fuel which creates the "Reaction" of the upward force on the rocket
c)
The rocket's mass requires a greater force to move
2.
Which of the following formulas is used to find ACCELERATION?
a)
Mass/Force
b)
Force/Mass
c)
Mass x Force
3.
When 2 OPPOSING forces are acting on an object, to find acceleration you must first do this.
a)
Determine the object's speed
b)
Find Net force by subtracting the smaller force from greater
c)
Determine what the object is made out of
d)
Find Net force by adding the forces together
4.
How can the work being done in this image be done with less effort?
a)
Move the fulcrum closer to the force
b)
Move the force to the end of the ramp
c)
Move the fulcrum closer to the load
d)
Move the fulcrum to the end of the ramp
5.
Which of the following MUST be present for work to be completed?
a)
the object moves in the direction the force is applied
b)
an element of time
c)
as long as there is a force being applied, work is being done
d)
the object moves in any direction
6.
What is the best explanation as to why a pulley makes work easier?
a)
they make the load lighter, thus easier to move
b)
they decrease the force needed to move an object
c)
they change the direction of the force needed to do work
d)
they decrease the distance an object must be moved
7.
Without this, "work" is not being performed?
a)
effort
b)
force
c)
time
d)
movement
8.
True or False: An object's mass has NO AFFECT on the object's rate of acceleration.
a)
True- mass does NOT affect acceleration rate
b)
False- Smaller the mass= Faster the acceleration rate
c)
False- Greater the mass= Faster the acceleration rate
9.
For an inclined plane (ramp) to make work easier, which must be TRUE of the inclined plane?
a)
it must cover a longer distance
b)
it must be really steep
c)
it must cover a shorter distance
d)
it must be vertical
10.
At what point is there the greatest amount of kinetic energy? *pendulum swinging from point A to point D
a)
point A
b)
point B
c)
point C
d)
point D
11.
True or False: A curved line on a Position vs Time graph indicates a constant speed
a)
True
b)
False
12.
An increase or a decrease in an object's speed means which of the following is true?
a)
A change has occurred in the object's mass
b)
Balanced forces are acting on the object
c)
Unbalanced forces are acting on the object
13.
Which of the following is an example of a "natural" force influencing life on earth?
a)
gravity
b)
positioning
c)
speed
d)
age
14.
The segment of the graph from 5 sec-10 sec shows the graphed object is doing what?
a)
slowing down
b)
at a stop
c)
speeding up
d)
this segment tells us nothing about the object
15.
True or False: As a rubber band is being stretched, Potential Energy is being converted into Kinetic Energy
a)
True
b)
False
16.
Which of the following would cause an object at rest to begin moving?
a)
sudden change in mass
b)
sudden change in temperature
c)
unbalanced forces acting on the object
d)
an applied action
17.
A change in the _________ of force makes work easier.
a)
input
b)
output
c)
direction
d)
level
18.
An object's kinetic energy is evident because of the object's what?
a)
position
b)
mass
c)
movement
d)
weight
19.
An object will move in which direction?
a)
the same direction as the force that is applied to it moves
b)
always right or left
c)
in the opposite direction of the force that is applied to it
d)
there is really no way to tell which way it till move
20.
True or False: Friction does NOT affect the speed at which a car goes down a ramp
a)
True
b)
False- adding or taking away friction DOES change the speed
21.
What force keeps our hearts beating?
a)
gravitational forces bc we are on earth
b)
balanced forces when the heart fills with blood
c)
unbalanced forces when blood is being pushed through it
22.
What type of energy is stored in fuel/gasses?
a)
Chemical
b)
Nuclear
c)
Electrical
d)
Thermal
23.
What type of energy is stored in heat?
a)
Chemical
b)
Mechanical
c)
Thermal
d)
Magnetic
24.
What type of energy is stored in objects that are in motion?
a)
Chemical
b)
Mechanical
c)
Potential
d)
Gravitational
25.
Complete the definition: "For every action there is a ________"
a)
purpose
b)
start
c)
reason
d)
reaction
26.
Why do objects that are moving in outer space keep moving?
a)
because there is not an unbalanced force acting on them
b)
both answers are correct
c)
because there is little or no gravity
d)
neither answer are correct
27.
Velocity is the measurement of what 2 things?
a)
speed & acceleration
b)
direction & distance
c)
speed & direction
d)
direction & force
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