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Work, Energy and Power Review

Total questions: 40

Worksheet time: 2hrs 0mins

Name
Class
Date
1.

Energy is:

a)

A Charge

b)

Eating sugar and getting HYPE!

c)

The ability to do work

d)

mass

2.

Which of the following is NOT work?

a)

A change in potential energy

b)

A change in kinetic energy

c)

A Force acting over a distance

d)

A change in mass

3.

Which of the following is required to have gravitational potential energy?

a)

Velocity

b)

Height

c)

Time

d)

Kinetic Energy

4.

Which of the following are required in order to have kinetic energy?

a)

Height

b)

Time

c)

Acceleration

d)

Speed or velocity

5.

Which of the following would NOT result in work being done?

a)

A change in speed or velocity

b)

A change in mass

c)

A change in height

d)

A force acting over a distance

6.

Which of the following are required in order to have power?

a)

Work

b)

A change in mass

c)

Constant speed or velocity

d)

Constant height

7.

Saul and Martin both do 100,000 J of work when jogging. Saul does it in 80 seconds and Martin does it in 75 seconds. Who has more power and why?

a)

Saul, because he does it in less time

b)

Martin, because he does it in less time

c)

Saul, because he does it in more time

d)

Martin, because he does it in more time

8.

Which sets of units represent legitimate units for the quantity work?

a)

newton x meter

b)

kg x m2s2kg\ \ x\ \frac{m^2}{s^2}

c)

kg x mskg\ x\ \frac{m}{s}

d)

Joules

e)

kg x ms2kg\ x\ \frac{m}{s^2}

9.

Marisol and Tim both do 50,000 Joules of work while cutting their grass. Marisol completes the task in 1200 seconds and Tim completes the task in 1500 seconds. Who has LESS power and why?

a)

Tim, because it took him less time

b)

Tim, because it took him more time

c)

Marisol, because it took her more time

d)

Marisol, because it took her less time

10.

Sebastian starts his car and drives down the road with a half a tank of gas. What is the energy conversion in this scenario?

a)

Kinetic Energy to Chemical Potential Energy

b)

Gravitational Potential Energy to Kinetic Energy

c)

Nuclear Potential Energy to Kinetic Energy

d)

Chemical Potential Energy to Kinetic Energy

11.

Silly Sally leaves her iPhone on top of a brick wall. Then it falls off of the wall. What is the energy transformation?

a)

Gravitational potential energy to Kinetic Energy

b)

Kinetic Energy to gravitational potential energy

c)

Electrical potential energy to kinetic energy

d)

Spring potential energy to kinetic energy

12.

North Korea tests a nuclear bomb by dropping it in the ocean. What is the energy transformation (Ignore gravitational potential energy!)

a)

Kinetic Energy to Nuclear Potential Energy

b)

Elastic Potential Energy to Kinetic Energy

c)

Electrical potential energy to Kinetic Energy

d)

Nuclear Potential Energy to Kinetic Energy

13.

A basketball is bounced on a court. What is the energy transformation in this scenario?

a)

Kinetic Energy to Chemical Potential energy

b)

Electrical Potential Energy to Kinetic Energy

c)

Elastic Potential Energy to Kinetic Energy

d)

Nuclear Potential Energy to Kinetic Energy

14.

Velocity and kinetic energy have a _______________ relationship.

a)

Inverse

b)

Direct

c)

Reverse

d)

Diagonal

15.

Height and gravitational potential energy have a _________________ relationship.

a)

Difficult

b)

Reverse

c)

Inverse

d)

Direct

16.

A football has a potential energy of 100 J. If the height increases by a factor of 10, what would be the new potential energy?

a)

10 J

b)

1000 J

c)

1 J

d)

10,000 J

17.

A toy plane has a potential energy of 100 J. If the height decreases by a factor of 4, what is the new potential energy?

a)

25 J

b)

400 J

c)

1600 J

d)

6.25 J

18.

A toy car has 100 J of kinetic energy. If the velocity decreases by a factor of 8, what is the new kinetic energy?

a)

1.56 J

b)

12.5 J

c)

800 J

d)

1600 J

19.

An object has 100 J of kinetic energy. If the velocity increases by a factor 5, then what is the new kinetic energy?

a)

2500 J

b)

500 J

c)

20 J

d)

4 J

20.

A frisbee has 100 J of kinetic energy. If its speed decreases by a factor of 9, then what is the new kinetic energy?

a)

8100 J

b)

900 J

c)

11.11 J

d)

1.23 J

21.

Hector carries his Playstation 5 to his car. Is this positive work, negative work or no work?

a)

Positive Work

b)

Negative Work

c)

No Work

d)

Can Not be determined

22.

Lupe lowers a picture that is hanging a wall. Is this an example of positive work, negative work or no work?

a)

Positive Work

b)

Negative Work

c)

No Work

d)

Can Not be determined

23.

Terry lifts his couch to find the missing remote control. Is this an example of positive work, negative work or no work?

a)

Positive Work

b)

Negative Work

c)

No Work

d)

Can Not Be Determined

24.

Consider the image above. At point one, which of the following is true?

a)

Low potential energy and high kinetic energy

b)

High potential energy and low kinetic energy

c)

High potential energy and high kinetic energy

d)

Low Potential energy and low kinetic energy

25.

Consider this image. At point 3, which of the following is true?

a)

Kinetic energy is high and potential energy is low

b)

Potential energy is high and kinetic energy is low

c)

Potential Energy is high and kinetic energy is high

d)

Kinetic energy is low and potential energy is low

26.

Terri has a mass of 85 kg and is standing on a diving board that is 8 meters high. How much gravitational potential energy does she have?

a)

106.25 J

b)

6800 J

c)

68 J

d)

54,400 J

27.

A box of clothes with a mass of 55 kg has 15000 J of potential energy. What is the height of the box of clothes?

a)

27.27 meters

b)

272.72 meters

c)

2,727.27 meters

d)

8250000 meters

28.

A toy train with a mass of 12 kg is moving with a velocity of 7 m/s. How much kinetic energy does the train have?

a)

42 J

b)

84 J

c)

588 J

d)

294 J

29.

A race car has a mass of 1500 kg. If the kinetic energy is 675,000 J, what is the velocity of the racecar?

a)

21.21 m/s

b)

30 m/s

c)

1500 m/s

d)

900 m/s

30.

An elephant with a mass of 5500 kg, moves with 1,000,000 J of kinetic energy. How fast does the elephant move?

a)

363.63 m/s

b)

181.81 m/s

c)

13.48 m/s

d)

19.07 m/s

31.

A basketball has 2000 J of work done on it over 27 meters. What is the force on the basketball?

a)

54000 N

b)

1973 N

c)

74.07 N

d)

0.0135 N

32.

A boxer provides 1500 N of force over 0.3 meters while punching an opposing boxer. What is the work done by the boxer?

a)

5000 J

b)

0.0002 J

c)

450 J

d)

1499.97 J

33.

A bowling ball with 1200 J of gravitational potential energy falls and ends on the ground. What is the work done?

a)

+1200 J

b)

-1200 J

c)

0 J

d)

-600 J

34.

A car with 100,000 J of kinetic energy changes to having 500,000 J of kinetic energy. What is the work done?

a)

+500,000 J

b)

+100,000 J

c)

-400,000 J

d)

+400,000 J

35.

A bird is flying with 1200 J of gravitational potential energy and 600 J of kinetic energy. What is the total mechanical energy of the bird?

a)

1200 J

b)

600 J

c)

1800 J

d)

0 J

36.

Abby has a mass of 50 kg and is going for a run. If her speed changes from 5 m/s to 7.5 m/s, what is work done on Abby?

a)

312.5 J

b)

125 J

c)

62.5 J

d)

781.25

37.

A machine has a power of 12,000 watts while completing 4,800,000 Joules of work. How long does is take the machine to do this amount of work?

a)

4000 s

b)

0.00025 s

c)

5.76x1010 s5.76x10^{10}\ s

d)

Can not be determined

38.

It takes 0.5 seconds for a crane to move an object with a potential energy of 1000 J to a potential energy of 4000 J. What is the power of the machine?

a)

8000 watts

b)

4000 watts

c)

6000 watts

d)

2000 watts

39.

A 750 kg car has it velocity change from 25 m/s to 5 m/s. What is the work done on the car?

a)

+225,000 J

b)

-7500 J

c)

-450,000 J

d)

-225,000 J

40.

A 45 kg stone is moved from a height 20 meters to 2 meters. If this is done in 10 seconds, what is the power needed to accomplish this?

a)

0 watts

b)

405 watts

c)

810 watts

d)

1620 watts

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