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Force / Energy Review

Total questions: 66

Worksheet time: 1hrs 6mins

Name
Class
Date
1.

Looking at the roller coaster, were does the cart-earth system have the most potential energy?

a)

A

b)

B

c)

C

d)

D

2.
What is the definition of acceleration?
a)
Change in speed or direction
b)
displacement divided by time
c)
the amount of distance covered in a certain amount of time
d)
An object at rest
3.
Niagara Falls is a good example of
a)
Kinetic energy being transformed into potential energy
b)
Potential energy being transformed into kinetic energy
c)
Energy being created
d)
Energy being destroyed
4.
Which has the most kinetic energy?
a)
a basketball rolling down a hill
b)
a bus stopped at the top of a hill
c)
a dump truck driving down a hill
d)
a golf ball sitting at the top of the hill
5.

A student observes that the craters on the moon are different sizes. The student designs an experiment to study the formation of craters. The materials for the experiment are marbles and a pan of flour. The student makes a hypothesis that the size of the craters made on the surface of the flour will depend on the height from which the marble is dropped. Some of the steps in the student's experiment are described in the picture. Which of these is most likely Step 3 in the student's experiment? (5.6D)

a)

Drop the same marble from different heights into the pan of flour

b)

Drop marbles of different masses from the same height into the pan of flour

c)

Drop marbles of different sizes from different heights into the pan of flour

d)

Drop a single marble one time into the pan of flour

6.
When conducting an experiment, in order to get reliable results, it is important to:
a)
Disregard results that do not match your hypothesis
b)
Test many different variables at the same time
c)
Test all forces at the same time
d)
Repeat the investigation several times
7.
A boy applies a pushing force on a ball thrown into the air. What applies a pulling force on the ball at the same time?
a)
Gravity
b)
The height of the boy
c)
Friction
d)
The mass of the ball
8.
What is the net force?
a)
40 N left
b)
0 N Balalnced
c)
400 N right
d)
40 N right
9.
At which point does the cart have the greatest amount of kinetic energy?
a)
W
b)
X
c)
Y
d)
Z
10.
A dropping a book shows both gravitational potential energy and kinetic energy.  What could be said about the change in energy as the book falls?
a)
Kinetic energy increases, and the graviational energy increases
b)
Kinetic energy decreases, and the gravitational energy decreases
c)
Kinetic energy decreases, and the gravitational energy increases
d)
Kinetic energy increases, and the gravtiational energy decreases
11.

The neighbor's cat ran through your yard. The cat has a mass of 1 kg. He is running at a speed of 2 m/s. What is the kinetic energy of the cat as he runs? KE=1/2 (m)(v^2)

a)

4 J

b)

3 J

c)

1 J

d)

2 J

12.

What is the net force (magnitude) acting on the box?

a)

5N

b)

25N

c)

15N

d)

0N

13.

There is a book sitting at rest on a chair. Which of the following is true?

a)

There are many forces acting on the book, but they balance each other out

b)

The book exerts no force on the chair

c)

The chair exerts no force on the book

d)

all of these

14.

What letter represents an object moving toward the point of reference?

a)

A

b)

B

c)

C

d)

D

15.

The force that pulls objects toward the center of the earth is what?

a)

Force

b)

Gravity

c)

Friction

d)

Motion

16.
Calculate the work needed to raise a 3 kg cat up to a height of
4 m.
a)
12 J
b)
0 J
c)
120 J
d)
1.22 J
17.
Calculate the PE of a 2 kg cat perched 10 meters above the ground. 
a)
20 J
b)
200 J
c)
2.04 J
d)
200 W
18.
When my velocity triples, my kinetic energy increases by ______ times.
a)
9
b)
 3 
c)
1.5
d)
4.5
19.
Calculate the Kinetic Energy (KE) of a girl whose mass is 50 kg who is moving at 4 m/s.
a)
200 J
b)
800 J
c)
400 J
d)
100 J
20.
Sue lowers a stack of books with a mass of 20 kg over a distance of 2 meters.  Calculate work.
a)
400 J
b)
-40 J
c)
-400 J
d)
-20 J
21.
A 10.0 kg box is accelerated from 2.0 m/s to 4.0 m/s.  What is the amount of work in joules needed to accelerate the box?
a)
50.0
b)
60.0
c)
20.0
d)
45.0
22.
Belly-Flop Bernie dives from atop a tall flagpole into a swimming pool below. His potential energy at the top is 10,000J. What is his kinetic energy when his potential energy reduces to 9.7J?
a)
9.81J
b)
10,000J
c)
9.7J
d)
9,990.3J
23.
As a pendulum swings from its highest to lowest position, what happens to its kinetic and potential energy? 
a)
Both the potential energy and kinetic energy decrease
b)
The potential energy decreases while the kinetic energy increases 
c)
The kinetic energy decreases while the potential energy increases 
d)
Bothe the potential energy and kinetic energy increase 
24.
The SI unit of work is?
a)
Joules
b)
Watts
c)
Newtons
d)
meters
25.
The SI Unit for Mass?
a)
Kilogram (Kg)
b)
Newton (N)
c)
Joule (J)
d)
Watt (W)
26.

Sierra set up these ramps. She placed the same car at the top of each ramp. What question is she most likely investigating?

a)

How do different surfaces effect the car's distance travelled?

b)

How does the incline of a ramp affect the car's speed?

c)

How does solar power effect the car's distance?

d)

How much force can be placed on the car?

27.

An arrow in a bow had 70J of PE. Assuming no loss of energy to heat, how much KE will it have right before it hits the ground?

a)

0J

b)

35J

c)

50J

d)

70J

28.
A woman lifts 20 bricks, each of weight 6N.
What other information is needed to calculate the useful work done in lifting the bricks?
a)
the distance she lifts the bricks
b)
the mass of the bricks
c)
the time taken to lift the bricks
d)
the volume of the bricks
29.
How far does the car travel before it reaches a steady speed?
a)
10m
b)
20m
c)
100m
d)
200m
30.
Which statement about mass and weight is correct?
a)
Mass and weight are both forces
b)
Neither mass nor weight is a force
c)
Only mass is a force
d)
Only weight is a force
31.

If there are no outside forces acting on a system, the total energy of the system

a)

Increases constantly.

b)

Decreases constantly.

c)

Is constant.

d)

Depends on the work done on the system.

e)

Depends on the work done by the system.

32.

A light plastic cart and a heavy steel cart are both pushed with the same force for a distance of 1.0 m, starting from rest. After the force is removed, the kinetic energy of the light plastic cart is ________ that of the heavy steel cart.

a)

greater than

b)

equal to

c)

less than

d)

can't say unless we know how big the force is

33.

A light plastic cart and a heavy steel cart are both pushed with the same force for a distance of 1.0 m, starting from rest. After the force is removed, the velocity of the light plastic cart is ________ that of the heavy steel cart.

a)

greater than

b)

equal to

c)

less than

d)

can't say unless we know how big the force is

34.

Each of the boxes shown is pulled for 10 m across a level, frictionless floor by the force given. Which box experiences the greatest change in its kinetic energy?

a)

A

b)

B

c)

C

d)

D

e)

E

35.

Rank in order, from largest to smallest, the gravitational potential energies of the balls.

a)

1 > 2 = 4 > 3

b)

1 > 2 > 3 > 4

c)

3 > 2 = 4 > 1

d)

3 > 2 > 4 > 1

36.

Starting from rest, a marble first rolls down a steeper hill, then down a less steep hill of the same height. Ignoring friction, for which is it going faster at the bottom?

a)

Faster at the bottom of the steeper hill

b)

Faster at the bottom of the less steep hill

c)

Same speed at the bottom of both hills

d)

Can’t say without knowing the mass of the marble

37.

A small child slides down the four frictionless slides A–D. Rank in order, from largest to smallest, her speeds at the bottom.

a)

vD > vA > vB > vC

b)

vD > vA = vB > vC

c)

vC > vA > vB > vD

d)

vA = vB = vC = vD

38.

A rock has 10 J of potential energy on top of a roof. If it is dropped and lands with only 8 joules of kinetic energy, how much work did air resistance do on the rock?

a)

-18 J

b)

-10 J

c)

-8 J

d)

-2 J

39.

In the equation PE = mgh, what does the “g” mean?

a)

Acceleration due to gravity

b)

Force of gravity

c)

Weight of the object

40.

Which requires more work – a person walking up stairs or a person running up stairs?

a)

walking

b)

running

c)

they require equal work

d)

no work is required for either because the movement is vertical

41.

A basketball that is dropped bounces back up to its original height. Pick the correct energy transformation from the point when it was dropped until it returns to the original height.

a)

KE --> PE --> Elastic

b)

PE --> KE --> Elastic --> KE --> PE

c)

KE --> PE --> Elastic --> PE --> KE

d)

Elastic --> PE --> KE --> Elastic

42.
Heavier objects fall faster than light ones.
a)
True
b)
False
43.
The moon is in free fall around the Earth.
a)
True
b)
False
44.
An insect flying through the air smacks into the windshield of a rapidly-moving train. The force the windshield exerts on the insect is higher than the force the insect exerts on the windshield.
a)
TRUE
b)
FALSE
45.
A 4 kg object is released from rest from a height of 10 m. Just before it hits the ground, its velocity in m s-1 is: 
a)
a. 200
b)
b. 14.1
c)
c. 4.5
d)
d. 28.3
46.

A toy is released from rest down a smooth slide from a height of 10 m.

How fast is it going at the bottom?

a)

I don't have enough information!

b)

100 m s-1

c)

50 m s-1

d)

10 m s-1

47.

A soccer player kicks a soccer ball high into the air. The ball travels up and then back down toward the ground. Which of these graphs best represents the soccer ball's potential, kinetic, and total energy at its highest altitude?

a)
b)
c)
d)
48.

An airplane traveling at a constant altitude loses mass as it uses up jet fuel. What happens to the plane's potential energy as it uses up fuel?

a)

As mass decreases, the plane's potential energy will increase.

b)

As mass decreases, the plane's potential energy will stay the same.

c)

As mass decreases, the plane's potential energy will decrease.

d)

It is impossible to tell because we don't know the height of the plane.

e)

It is impossible to tell because we don't know the acceleration due to gravity.

49.

A force of 8 Newton’s is applied to a crate so that it moves at a constant velocity of 1.5 m/s. What is the net force?

a)

1.5 N

b)

8 N

c)

12N

d)

0 N

50.

A force of 8 Newton’s is applied to a crate so that it moves at a constant velocity of 1.5 m/s. What is the magnitude of the frictional force?

a)

1.5 N

b)

8 N

c)

12N

d)

0 N

51.

Here are 3 FBD diagrams for an elevator. Consider them to be A, B, C. Which one shows an elevator accelerating upward?

a)

A

b)

B

c)

C

d)

none of these

52.

Here are 3 FBD diagrams for an elevator. Consider them to be A, B, C. Which one shows an elevator at rest?

a)

A

b)

B

c)

C

d)

none of these

53.

Here are 3 FBD diagrams for an elevator. Consider them to be A, B, C. Which one shows an elevator moving upward but braking?

a)

A

b)

B

c)

C

d)

none of these

54.

Here are 3 FBD diagrams for an elevator. Consider them to be A, B, C. Which one shows an elevator moving at a constant rate of 2.5 m/s?

a)

A

b)

B

c)

C

d)

none of these

55.

Is it possible for the object in the diagram to be moving to the right and have this FBD?

a)

Yes. It's possible that the x forces were just left off the diagram.

b)

Yes. It could be moving at a constant velocity.

c)

No. The FBD shows that the system is in equilibrium.

d)

No. An FBD shows all F.

56.
The Earth pulls downward on a pingpong ball with a force  of 1N. If this is the "action" force, what is the "reaction" force?
a)
The ground exerts a force of 1N on the ping pong ball
b)
The ping pong ball exerts a force of 1 N on the Earth
c)
The ping pong ball pushes down on the earth with a force of 1N
d)
The is no reaction force when a gravitational force is involved
57.
Which of the following is true about the system shown?
a)
The system is not accelerating.
b)
The tension between m2 and m1 is less than the tension between m2 and m3
c)
The acceleration of the system only depends on m3
d)
None of the other answers are true
58.

A man standing on a scale in an elevator notices that the scale reads 40 newtons greater than his normal weight. Which type of movement of the elevator could cause this greater-than-normal reading?

a)

accelerating upward

b)

accelerating downward

c)

moving upward at a constant speed

d)

moving downward at a constant speed

59.

An object is thrown vertically upward with an initial speed of 15 m/s. What is the total time in the air?

a)

3 second

b)

1.5 seconds

c)

5 seconds

d)

3.5 seconds

60.
a)
A
b)
B
c)
C
d)
D
61.
a)
A
b)
B
c)
C
d)
D
62.
a)
A
b)
B
c)
C
d)
D
63.
a)
It is at a maximum when the pendulum is at its lowest point
b)
It is at a maximum when the pendulum is at its maximum height h
c)
It is constant throughout the pendulum's motion
d)
It is at a minimum when the pendulum is somewhere between its lowest and highest positions
64.
a)
FB = FA = Fg
b)
(FB = FA) < Fg
c)
FB < (FA = Fg)
d)
Fg < FB < FA
65.
Each of the figures above shows a tractor attached to an object. The tractor exerts the same constant force F on each object in each case. Which of the following is a true statement about an object and the relative magnitude of the force exerted by the object on the tractor?
a)
The magnitude of the force exerted by the truck on the tractor is greatest, because the resulting motion is in direction opposite the tractor's pull
b)
The magnitude of the force exerted by the boulder on the tractor is least, because no motion results
c)
The magnitude of the force exerted by the wagon on the tractor is least, because the resulting motion is in the direction of the tractor's pull
d)
The magnitude of the force exerted by each object on the tractor is equal, because tractor exerts an equal force on the object
66.

Starting from rest, a marble first rolls down a steeper hill, then down a less steep hill of the same height. Keeping in mind friction, for which is it going faster at the bottom?

a)

Faster at the bottom of the steeper hill

b)

Faster at the bottom of the less steep hill

c)

Same speed at the bottom of both hills

d)

Can’t say without knowing the mass of the marble

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