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Work & Energy

Total questions: 45

Worksheet time: 1hrs 29mins

Name
Class
Date
1.
At which point(s) on the roller coaster is the gravitational potential energy at its maximum?
a)
A
b)
B
c)
C
d)
D
2.
At which point(s) on the roller coaster is the kinetic energy at its maximum?
a)
A
b)
B
c)
C
d)
D
3.
In diagram 2, if the mass of the car is 600 kg, what is the change in potential energy from point A to point B?
a)
411,600 J
b)
294,000
c)
176,400 J
d)
117,600 J
4.
In diagram 2, if the 600 kg cart is initially at rest, what is its velocity at point B?
a)
19.8 m/s
b)
15.0 m/s
c)
10.3 m/s
d)
3.8 m/s
5.
The spring in the diagram below is compressed 2.1 cm.  What is the velocity of the 6.3 g marble as it is launched if the force constant, k, is 158 N/m?
a)
2.41 m/s
b)
4.21 m/s
c)
3.32 m/s
d)
1.18 m/s
6.
A 0.022 kg toy popper is compressed 2.5 cm and placed on the table top. When the popper activates it flies to its maximum height in 0.6 seconds. The popper’s spring constant is 533 N/m. Calculate the height the popper reached to the nearest tenth place
a)
0.41 m
b)
0.61 m
c)
0.77 m
d)
0.94 m
7.
What is the energy of position or shape that depends on weight and height, also called stored energy?
a)
Energy
b)
Kinetic energy
c)
Potential energy
d)
Sound energy
8.
As energy transformations occur within a system, the total energy of the system ___.
a)
increases
b)
decreases
c)
is transferred out of the system
d)
remains constant
9.
A cheetah can run briefly with a speed of 31m/s.  Suppose a cheetah with a mass of 47 kg runs at this speed.  What is the cheetah’s kinetic energy?
a)
22583.5 J
b)
728.5 J
c)
1457 J
d)
0.75 J
10.
With an elevation of 5334m above sea level, the village of Aucanquilca, Chile is the highest inhabited town in the world.  What would be the gravitational potential energy associated with a 64kg person in Aucanquilca?
a)
3345484 J
b)
5407.8 J
c)
816.76 J
d)
72.31 J
11.
When a 65 kg skydiver jumps from a plane, her speed steadily increases until air resistance provides a force that balances the force due to free fall.  How fast is the skydiver falling if her kinetic energy at the moment is 704000J?
a)
21661.53 m/s
b)
147.17 m/s
c)
22880.0 km/s
d)
10830.76 m/s
12.
A boy lifts a 3.1 kg book from his desk, which is .80m high, to a bookshelf that is 2.5m high. What is the potential energy of the book-Earth system relative to the desk when the book is on the shelf?
a)
5.3J
b)
52J
c)
-52J
d)
None of the Above
13.
A bike rider approaches a hill at a speed of 5.5 m/s. The combined mass of the bike and rider is 87kg. Find the initial kinetic energy of the system. 
The rider coasts up the hill. Ignoring friction, at what height will the bike come to rest?
a)
1316J, 1.5m
b)
2316J, 2.5m
c)
1457J, 3.5m
d)
none of the above
14.

The given graph shows the releation between gravitional potential energy & height . If the mechanical energy at height A= 0.49 what is the kinetic energy

a)

0.10 j

b)

0.01 j

c)

0.5 j

d)

0.49 j

15.
What does the Law of Conservation of Energy state?
a)
Energy cannot be created or destroyed
b)
Nothing can exchange energy
c)
Energy will increase over time.
d)
Energy will decrease over time.
16.
The faster an object moves, the ________ kinetic energy it has. 
a)
more
b)
less
c)
none of the above
d)
all of the above 
17.
Can energy be destroyed?
a)
no
b)
yes
18.
Can energy be changed?
a)
yes
b)
no
19.

The two factors that determine the amount of kinetic energy in an object are______________ and____________>

a)

height and mass

b)

speed and velocity

c)

height and gravity

d)

mass and velocity

20.
Work is done when a _______ moves something.
a)
motion
b)
force
c)
friction
d)
energy
21.
The net work done by a net force acting on an object is equal to the change in the kinetic energy of the object.
a)
Force-Work Theorem
b)
Work-Kinetic Energy Theorem
c)
Force-Kinetic Energy Theorem
d)
Work-Force Theorem
22.
When my velocity triples, my kinetic energy increases by ______ times.
a)
9
b)
 3 
c)
1.5
d)
4.5
23.
True or false: the net work done on a body is equal to its change in kinetic energy.
a)
True
b)
False
24.

What does work equal when the final change in kinetic energy equals 20,000 J?

a)

0J

b)

2041J

c)

20,000J

d)

4164931J

25.

A ball is thrown up into the air. If the zero point is at the max height of the ball, what kind of energy does the ball have at the very top?

a)

Kinetic Energy

b)

Gravitational Potential Energy

c)

Spring Potential Energy

d)

No Energy

26.

Which of the following statements are true about work?

a)

Work is a form of energy.

b)

A Watt is the standard metric unit of work.

c)

Work is a time-based quantity; it is dependent upon how fast a force displaces an object.

d)

None of these.

27.

To find gravitational potential energy, you need which two variables?

a)

mass, force

b)

force, distance

c)

mass, velocity

d)

height, mass

28.

45 J of work were done on the object that moved 5 meters. How much force was applied to the object?

a)

8 N

b)

225 N

c)

9 N

d)

0 N

29.

What is the ΔKE of a baseball hit with a force of 6000 N that travels 120 m across the field?

a)

6000J

b)

43560000J

c)

720000J

d)

50J

30.

A 10.0 kg box is accelerated from 2.0 m/s to 4.0 m/s. What is the amount of work needed to accelerate the box?

a)

50 J

b)

60 J

c)

20 J

d)

45 J

31.

What does work equal when the final change in kinetic energy equals 20,000 J?

a)

0J

b)

2041J

c)

20,000J

d)

4164931J

32.

A 12 kg book is pushed from rest to a final velocity of 10 m/s. The book travels 6 m. How much force was the book pushed with?

a)

600 N

b)

100 N

c)

200 N

d)

1200 N

33.
What is the work done by the man?
a)
0 J
b)
65 J
c)
6500 J
d)
0.0065 J
34.
How much work is done if you pull a wagon with 40 N and it moves 4 m?
a)
10 J
b)
160 J
c)
1600 J
d)
0.1 J
35.
The unit used to measure work is the 
a)
Watt
b)
Newton
c)
Joule
d)
meter
36.
What is the equation for work?
a)
W = mass * acceleration
b)
W = force * distance
c)
W = force/distance
d)
W = speed/time
37.
In which one of the following situations is zero net work done?
a)
A ball rolls down an inclined plane.
b)
A physics student stretches a spring.
c)
A projectile falls toward the surface of Earth.
d)
A box is pulled across a rough floor at constant velocity.
e)
A child pulls a wagon across a rough surface causing it to accelerate.
38.
How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes?
a)
15 J
b)
45 J
c)
0 J
d)
5 J
39.
If 800 N of force is applied to move an object 20 meters, how will be how much work done?
a)
40 J
b)
1,600 J
c)
400 J
d)
16,000 J
40.
If 150 Joules of work is needed to move a box 10 m, what force was used? 
a)
1500 N
b)
15 N
c)
1.5 N
d)
150 N
41.
If you push a coffee mug 1.4 m using a force of 5 N, the work done on the mug is?
a)
7 J
b)
6 J
c)
8 J
d)
9 J
42.
If someone does 508 J of work pushing a cart 29 m, how much force did he apply?
a)
16.48 N
b)
18.31 N
c)
15.89 N
d)
17.52 N
43.
Which situation is work not done?
a)
lifting a 20 pound box off the floor
b)
holding a 20 pound box above the floor
c)
sliding a 20 pound box across the floor
d)
sliding a 20 pound box up an inclined plane
44.

A 5 kg ball is lifted 12 m above the ground. It's gravitational potential energy is

a)

60 J

b)

600 J

c)

17 J

d)

2.4 J

45.

You drop a 5 kg ball from a height of 2 m. Just before it reaches the ground, what is the ball's velocity?

a)

6.32 m/s

b)

40 m/s

c)

4.47 m/s

d)

100 m/s

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