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Work Power & Energy

Total questions: 97

Worksheet time: 9hrs 25mins

Name
Class
Date
1.

Where does the pendulum have the greatest kinetic energy?

a)

A

b)

B

c)

C

d)

D

e)

E

2.

A cheetah can run briefly with a speed of 31 m/s. Suppose a cheetah with a mass of 47 kg runs at this speed. What is the cheetah’s kinetic energy?

a)

1457 J

b)

728.5 J

c)

45,167 J

d)

22,583.5 J

3.
Which of the following objects has the most kinetic energy?
a)
A 20 kg toddler running at 5 m/s
b)
A 50 kg toddler running at  30 m/s
c)
A 90 kg toddler running at 30 m/s
d)
A 100 kg  toddler running at 2 m/s
4.

Which of the is the equation for calculating work?

a)

W = Fd

b)

W = ma

c)

W = mv

d)

W = mc2

5.

The sum of the kinetic and potential energy in a system is known as the system's _____________________ energy.

a)

mechanical

b)

chemical

c)

thermal

d)

combined

6.

At which point in the picture must the cart have the most MECHANICAL energy?

a)

Point 1

b)

Point 2

c)

Point 3

d)

They would all be the same

7.

How much power is used when 9000 J of work are done in 0.5 seconds?

a)

4,500 W

b)

18000 W

c)

9453 W

d)

917.4 W

8.

This weight lifter raised 105 kg to a height of approximately 2.31 m in 9 seconds. How much power did he developed?

a)

264 Watts

b)

1029 Watts

c)

2,377 Watts

d)

4,009 Watts

9.

Two movers applied a total force of 350 N to push chest up a ramp into a truck. If the work that they did 1,400 J, calculate the height of the ramp?

a)

4 m

b)

3 m

c)

2 m

d)

1 m

10.

Two people are lifting the same weight as shown in the animation. If they both do 10 reps, who will supply the most power?

a)

Bro A

b)

Bro B

c)

They both will do the same work

d)

Can't tell without knowing the weight they are lifting

11.

An object of 2.03 kg is thrown vertically upwards at an initial speed of 10.41 m/s. What is the kinetic energy at the moment it is thrown?

a)

110 J

b)

1200 J

c)

2.03 J

d)

10.41 J

12.

An object of mass 0.328 kg moves along a straight path at a constant velocity.  If the kinetic energy is 14.7 J, determine the speed of the object.

a)

12.34 m/s

b)

0 m/s

c)

9.47 m/s

d)

5.16 m/s

13.

A 4.3 kg box on a platform has a potential energy of 349 J.  Determine the height of the platform.

a)

0 m

b)

8.27 m

c)

9.81 m

d)

2.43 m

14.

A 0.050 kg stone is dropped from a height of 15.67 m.  What is the potential energy at the instant of release?

a)

3.44 J

b)

0 J

c)

5.98 J

d)

7.68 J

15.

An object held at a height of 3.7 m has a potential energy of 209 J.  What is the mass of the object?

a)

5.76 kg

b)

8.97 kg

c)

4.32 kg

d)

11.98 kg

16.
How much work is being done with 200 N of force over 426 meters?
a)
85,200 J
b)
45,620 J
c)
90,480 J
d)
62,329 J
17.
If 150 Joules of work is needed to move a box 10 meters, what force was used? 
a)
1500 N
b)
15 N
c)
1.5 N
d)
150 N
18.

Which of the following is the best example of work being done.

a)

doing homework

b)

lifting a box

c)

pushing a stationary box

d)

holding a box

19.
How much work is being done with 200 N of force over 426 meters?
a)
85,200 J
b)
45,620 J
c)
90,480 J
d)
62,329 J
20.

The SI unit of work

a)

Joules

b)

Watts

c)

Newtons

d)

meters

21.

The SI unit for power

a)

Watts

b)

Joules

c)

Newtons

d)

Meters

22.

Gravitational potential energy depends on the ________ and ________ of the object.

a)

Height and mass

b)

Spring constant and Distance away from equilibrium

c)

Mass and Velocity

d)

Height and Friction

23.

A student with a mass of 62.0 kg walks up a flight of stairs with a height of 3.40 meters. If it takes him 7.00 seconds to get to the top, how much power did he generate?

a)

295 W

b)

2070 W

c)

86.8 W

d)

295.12 W

24.

John and Bob weigh the same and both run up a flight of stairs. John reaches the top in 8 seconds while Bob follows in 10 seconds. Who has exhibited more power ?

a)

John

b)

Bob

c)

they both have the same amount of power

d)

not enough info is given to determine who has more power

25.

A student needs 10 Newtons of force to lift a box to the top of a 2 meter shelf. How much work do they do?

a)

12 J

b)

8 J

c)

20 J

d)

5 J

26.

Which two forces do NO work on the gold block?

a)

Fa

b)

Fg

c)

Ff

d)

Fn

27.

A 1000N force pulls a car for 300m to the left. What is the work done by the truck?

a)

-300,000 J

b)

-150,000 J

c)

0 J

d)

150,000 J

28.

The moon orbits Earth with a circumference of 2.4 * 109m, a constant speed of about 1,000 m/s, and a gravitational attraction of 2*1020 N. What is the work done on the moon by the Earth?

a)

0 J

b)

2.4 * 106 J

c)

2*1023 J

d)

4.8*1029 J

29.

Three blocks are each pushed from rest for 10 meters with forces shown. Which block has the most kinetic energy after 10m of travel?

a)

A

b)

B

c)

C

d)

not enough information

30.

A force changes over time. During which section does that force do the largest magnitude of work?

a)

A

b)

B

c)

C

d)

D

31.

A car travelling 10m/s to the right makes a U-turn and now travels -10m/s to the left. Determine the work done on the car during the turn?

a)

-20 J

b)

0 J

c)

20 J

d)

Depends on the mass of the car

32.
On a roller coaster, where is maximum potential energy?
a)
At the bottom of a big hill
b)
When going around a corner
c)
When going upside down
d)
At the top of a big hill
33.
At which point(s) on the roller coaster is the kinetic energy at its maximum?
a)
A
b)
B
c)
C
d)
D
34.
How do you calculate power?
a)
P = W/t
b)
P = E/t
c)
P = w * t
d)
P = bbq/chicken
35.
How do we calculate work?
a)
W = F * d
b)
w = f * D
c)
W = F * D
d)
w = f * d
36.
How much work is being done with 200 N of force over 426 meters?
a)
85,200 J
b)
45,620 J
c)
90,480 J
d)
62,329 J
37.

Elastic potential energy is at it's greatest when

a)

a rubber band is stretched all the way

b)

a rubber band is at it's smallest

c)

a rubber band is stretched half way

d)

the elastic in the waist of pants is stretched a small amount

38.
How much work is being done with 200 N of force over 426 meters?
a)
85,200 J
b)
45,620 J
c)
90,480 J
d)
62,329 J
39.
If 150 Joules of work is needed to move a box 10 meters, what force was used? 
a)
1500 N
b)
15 N
c)
1.5 N
d)
150 N
40.
The more POWER you use to move an object, the more work you do. 
a)
True
b)
False
41.
If 68 W of power is produced in 18 seconds, how much work is done?
a)
1,224 J
b)
0.264 J
c)
3.77 J
d)
12.24 J
42.
How much time is needed to produce 720 Joules of work if 90 watts of power is used? 
a)
0.125 s
b)
8 s
c)
64800 s
d)
80 s
43.
If 68 Joules were necessary to move a 4 Newton crate, how far was the crate moved?
a)
272 m
b)
17 m
c)
4.05 m
d)
272 cm 
44.

A 8.6 kg box is pushed across a floor 3.2 m with a force of 5.5 N. How much work is done on the box?

a)

17.6 J

b)

8.7 J

c)

1.72 J

d)

No work is done.

45.

An object of mass 6.8 kg is lifted to a height of 1.3 m. How much work is done on the object?

a)

86 J

b)

8.1 J

c)

5.23 J

d)

No work is done.

46.

How much power is required to do 40.2 J of work in 3.3 s?

a)

12.18 W

b)

132.66 W

c)

43.5 W

d)

0.08 W

47.

A force of 4.6 N moves a 2.7 kg box a distance of 3.3 m in 6.8 s. How much power is exerted?

a)

2.23 W

b)

6.03 W

c)

17.4 W

d)

278.7 W

48.
If 150 Joules of work is needed to move a box 10 meters, what force was used? 
a)
1500 N
b)
15 N
c)
1.5 N
d)
150 N
49.
How much work is being done with 200 N of force over 426 meters?
a)
85,200 J
b)
45,620 J
c)
90,480 J
d)
62,329 J
50.

If you carry a 5 kg box across the room at a constant velocity

a)

you do no work.

b)

you do some work.

c)

you do negative work.

d)

Cannot be determined.

51.

On a work vs time graph, you can calculate the power by

a)

the area.

b)

the y-axis.

c)

the y-intercept.

d)

the slope.

52.

How much power was generated from 0-4 seconds?

a)

1100 W

b)

4 W

c)

267 W

d)

1600 W

53.

How much work is done?

a)

9 J

b)

18 J

c)

27 J

d)

36 J

54.

If it took 9 seconds for the object to move 6 meters, what's the power?

a)

81 W

b)

27 W

c)

3 W

d)

6 W

55.

What is the mass of an object with 1200 J of PE when it is 5 meters above the ground?

a)

10 kg

b)

24 kg

c)

100 kg

d)

240 kg

56.

What kind of energy(ies) does the car have at position A? The ground is h=0.

a)

KE

b)

KE + PE

c)

PE

d)

KE - PE

57.

If a system is isolated, 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.

58.

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

59.
Jack pushes a lawnmower with a force of 25N and performs 250 J of work. How far did he push the mower?
a)
1 meter
b)
1 kilometer
c)
10 meters
d)
none of these
60.

A worker climbs a ladder and does 8 J of work on a 2 N object. What is the distance they lift the object?

a)

18 m

b)

4 m

c)

10 m

d)

6 m

61.
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
62.

Which list includes 3 vector quantities?

a)

energy, work, distance

b)

velocity, force, power

c)

acceleration, speed, work

d)

displacement, acceleration, force

63.

What does the work on a spring?

a)

an applied force

b)

the spring constant

c)

the kinetic energy

64.

What is deformation?

a)

gravitational potential energy

b)

change in the spring's length

c)

change in the force applied

65.

Which type of springs have low spring constants?

a)

stiff springs

b)

weak springs

66.

According to the data table, what variable is unchanged for each type of spring?

a)

the spring constant value

b)

the applied force

c)

the elastic potential energy

d)

the deformation

67.

If a spring stretches easily, it has a high spring constant.

a)

True

b)

False

68.

What does the slope of this graph represent?

a)

the spring constant, k

b)

the applied force, F

c)

the change in mass, m

d)

the negative displacement, x

69.

How is the force measured?

a)

Use a meter stick to measure length of displacement.

b)

Use a meter stick to measure mass.

c)

Use a spring scale and read the quantity in Newtons.

d)

Use a triple beam balance and read the quantity in grams.

70.

A rock sitting still at the top of a hill is an example of what type of energy?

a)

Potential

b)

Mechanical

c)

Kinetic

d)

Chemical

e)

Thermal

71.

When no friction or external applied forces are present, the total mechanical energy of a system will

a)

Increase

b)

Decrease

c)

Remain Constant

72.
A student does 60. joules of work pushing a 3.0 kg box up the full length of a ramp that is 5.0 meters long. What is the magnitude of the force applied to the box to do this work?
a)
4.0 N
b)
15 N
c)
12 N
d)
20. N 
73.
If a person lifts a 150 Newton ball 1.5m.  And it takes him 17 seconds.  How much work did he complete?  
a)
225 Joules
b)
3876 Watts
c)
13 Joules
d)
387.6 Watts
74.
A spring has a spring constant of 330 N/m.  How far is the spring compressed if 150 N of force are used?
a)
2.2 m
b)
0.0014 m
c)
5.0 m
d)
0.45 m
75.
A force of 470 N is applied to stretch a spring which has a spring constant, k=1100 N/m.  How much does the spring stretch past its free length?
a)
0.214 m
b)
2.34 m
c)
0.427 m
d)
5.17 X 10^5 m
76.
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
77.
A force of F=500 N is applied to extend a spring.  What is the displacement x of the spring if its spring constant is k= 540 N/m?
a)
0.96 m
b)
0.93 M
c)
1.3 m
d)
1.1 m
78.
A net force of 430 N acts to stretch an extension spring.  How far will the spring stretch if its spring constant is 700 N/m?
a)
43.9
b)
0.307 m
c)
1.63 m
d)
0.614 m
79.
What Quantity can you calculate from the graph and give the magnitude of that quantity.  
a)
distance 4.5 m
b)
Force 15 N
c)
spring constant 20 N/m
d)
spring constant 200 N/m
80.
A spring has a spring constant of 5N/cm.  What is its extension when loaded with 15N?
a)
4cm
b)
5cm
c)
3m
d)
3cm
81.
Hooke's Law describes the behaviour of which kind of material under tension?
a)
plastic
b)
metals only
c)
elastic
d)
non-metals only
82.
If F is force, k is spring constant and x is extension, Hooke's Law tells us that:
a)
F=k/x
b)
x=Fk
c)
k=Fx
d)
F=kx
83.
A stiff material has a:
a)
high spring constant
b)
low spring constant
c)
spring constant of any value
d)
spring constant which is difficult to predict
84.
An unstretched spring has a length of 0.10 meters. When the spring is stretched by a force of 16 newtons, its length is increased to 0.18 meters. What is the spring constant of this spring? 
a)
0.89 N/cm 
b)
2.0 N/cm 
c)
1.6 N/cm 
d)
1.8 N/cm
85.

Spring constant is measured in

a)

N

b)

N/m

c)

m

86.

What is the correct equation for Hooke's Law?

a)

F=mgkF=mgk  

b)

F=maF=ma  

c)

F=kΔxF=k\Delta x  

d)

F=kΔxF=\frac{k}{\Delta x}  

87.
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
88.
Which position shows the spring with maximum elastic potential energy?
a)
A
b)
B
c)
C
d)
D
89.

What is the spring constant for the system shown above?

a)

0.1 N

b)

10 N

c)

200 N/m

d)

50 N/m

90.

Which of the following would have a large spring constant?

a)

A spring that is stretched to its maximum displacement

b)

A spring that is at its equilibrium position

c)

A spring that is very thin and stretchy

d)

A spring that is very stiff and strong

91.
A spring has a spring constant of 330 N/m.  How far is the spring compressed if 150 N of force are used?
a)
2.2 m
b)
0.0014 m
c)
5.0 m
d)
0.45 m
92.
A spring with k=73 N/m is compressed 70 cm.  An object of mass 4 kg is attached to one end of the compressed spring.  What is the acceleration of the object at the moment the spring is released?  
a)
.078 m/s/s
b)
0.17 m/s/s
c)
13 m/s/s
d)
1.3 X 10^5 m/s/s
93.
Which of the following springs is the stiffest?
a)
A spring that requires a froce of 2000 N to compress it by 6.8 m.
b)
A spring that requires a force of 4000 N to stretch it by 9.0 m. 
c)
A spring that requires a force of 8000 N to compress it by 45 m.  
d)
A spring that requires a force of 4800 N to stretch it by 14 m.
94.
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
95.
Refer to picture.
a)
310 J
b)
3.3 J
c)
32 J
d)
0.34 J
96.
Refer to picture.
a)
25 N
b)
100 N
c)
50 N
d)
400 N
97.
Refer to picture.
a)
1.9 J
b)
30 J
c)
7.5 J
d)
56 J

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