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Work and Energy

Total questions: 31

Worksheet time: 37mins

Name
Class
Date
1.
What kind of energy is in a moving skateboard?
a)
Potential
b)
Kinetic
2.
What kind of energy is in a rock at the edge of a cliff?
a)
Potential
b)
Kinetic
3.

How much work is done if it takes 20N to move a box 10 meters

a)

0

b)

2

c)

20

d)

200

4.
In which of the following situations do your arms do work on books?
a)
holding a heavy stack of books while standing
b)
carrying a heavy stack of books
c)
dropping a stack of books onto a table
d)
picking up a pile of books from the floor
5.
If you do 40 joules of work lifting a 10N box, how high is the shelf you move it to.
a)
400m
b)
40m
c)
50m
d)
4m
6.

If a person falls down these stairs, what would happen to his potential energy?

a)

Increase

b)

Decrease

c)

Remain constant

7.
Calculate the KE of a runner that has a mass of 80 kg and is running at a velocity of 8 m/s
a)
5120 J
b)
320 J
c)
640 J
d)
2560 J
8.
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 
9.
At which point is potential energy greatest?
a)
W
b)
X
c)
Y
d)
Z
10.
At which point is kinetic energy greatest? 
a)
W
b)
X
c)
Y
d)
Z
11.

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

12.

How much power is required to raise a 200-kg crate a vertical distance of 2 m in a time of 4 s?

a)

400 W

b)

1000 W

c)

1600 W

d)

4000 W

13.

Lamar Gant, U.S. powerlifting star, became the first man to deadlift five times his own body weight in 1985. Deadlifting involves raising a loaded barbell from the floor to a position above the head with outstretched arms. Determine the work done by Lamar in deadlifting 300 kg to a height of 0.90 m above the ground.

a)

2.6 x 103 J

b)

4.8 x 103 J

c)

1.5 x 103 J

d)

3.7 x 103 J

14.
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
15.

Bobby lifts a book to the second floor in 20 seconds. Carol lifts the same book to the second floor in 10 seconds. Who did more work?

a)

Bobby

b)

Carol

c)

They did the same amount of work

d)

Not enough information

16.

Mass and speed both affect the amount of kinetic energy an object has, but ____________ has a greater effect.

a)

mass

b)

speed

c)

volume

d)

weight

17.
How much KE does a moving 6 kilogram object have if it moves with a velocity of 3 m/s?
a)
27 J
b)
18 J
c)
9 J
d)
2 J
18.
What is the mass of a moving object that has 100 Joules of KE and moves at a velocity of 2 m/s?
a)
50 kg
b)
200 kg
c)
25 kg
d)
100 kg
19.

What is potential energy?

a)

The energy an object has due to its position.

b)

The energy an object has due to its motion.

c)

The energy an object has due to its chemical composition.

d)

The energy as object has due to its atomic structure.

20.

A stretched rubber band represents what type of potential energy?

a)

gravitational potential energy

b)

elastic potential energy

c)

chemical potential energy

d)

kinetic potential energy

21.

What is the gravitational potential energy (GPE) of a 1 kilogram book that is 1 meter above the ground?

g = 9.8 m/s2

a)

9.8 Joules

b)

1.0 Joule

c)

0.10 Joule

d)

11.8 m/s2

22.
A 60.0 kg person walks from the ground to the roof of a 74.8 m tall building. How much gravitational potential energy does she have at the top of the building?
a)
43982.4 J
b)
63982.3 J
c)
43962.4 J
d)
83942.4 J
23.
A spring extends 1.5m under load 10N. What is its spring constant?
a)
0.15N/m
b)
10N/m
c)
6.7N/m
d)
15N/m
24.
A 5-newton force causes a spring to stretch 0.2 meter. What is the potential energy stored in the stretched spring?
a)
1 J
b)
0.5 J
c)
0.2 J
d)
0.1 J
25.
What force should be applied to compress a spring by 0.013 m if its spring constant is k = 1900 N/m?
a)
1880 N
b)
24.7 N
c)
1900 N
d)
0.127 N
26.
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.
27.
A 40 kg crate is picked up by a crane to a height of 50m. The crate falls. What is the velocity of the crate just before it hits the ground?
a)
2000 Joules
b)
19,600 Joules
c)
19,600 m/s
d)
31.3 m/s
28.

A 1.0 kg ball is stationary at the top of a hill that is 10.0 meters in height. The ball rolls all the way down the hill. What is its gravitational potential energy at the bottom of the hill?

a)

0 joules

b)

98 joules

c)

49 joules

d)

38 joules

29.

A student is holding the end of a pendulum. The student releases the pendulum. What energy transfers are taking place?

a)

gravitational potential energy is transferred to kinetic energy

b)

chemical energy to thermal energy

c)

mechanical energy to chemical energy

d)

kinetic energy is transferred to elastic potential energy

30.
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
31.

Calculate the force necessary to move a 1000 kg car from rest to 25 m/s in 130 m.

a)

1.274 x 106 N

b)

25,0000 N

c)

2403.85 N

d)

3.25 x 106 N

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