Quiz about Work Energy and Power

Question 1

A weightlifter lifts two 300 newton weights 1.5 meters off the ground. How much work has he done?

Accepted Answer

900 J

Answer

600 J

Answer

660 J

Answer

1200 J

Question 2

You do 90 joules of work in 30 seconds. How much power have you generated?

Accepted Answer

3 watts

Answer

30 watts

Answer

120 watts

Answer

270 watts

Question 3

You move a 0.8 kg object five meters in 4 seconds. How much power have you generated?

Accepted Answer

10 watts

Answer

160 watts

Answer

6.4 watts

Answer

17 watts

Question 4

Which of the following would produce the most power?

Accepted Answer

A mass of 10 kilograms lifted 10 meters in 5 seconds

Answer

A mass of 10 kilograms lifted 10 meters in 10 seconds

Answer

A mass of 5 kilograms lifted 10 meters in 5 seconds

Answer

A mass of 5 kilograms lifted 5 meters in 10 seconds

Question 5

How much work does an elephant do while moving a circus wagon 20 meters with a pulling force of 200N?

Accepted Answer

4000 joules

Answer

10 joules

Answer

220 joules

Answer

180 joules

Question 6

A 10 kg mass is lifted to 3 m. What is its weight? What is its potential energy? How much work is being done?

Accepted Answer

Weight = 98 N

PE = 294 J

Work = 294 J

Answer

Weight = 30 N

PE = 30 J

Work = 294 J

Answer

Weight = 10 kg

PE = 10 J

Work = 30 J

Answer

Weight = 98 N

PE = 294 J

Work = 30 J

Question 7

How much work is produced when 350 N is used to move a car 5 m (W=Fd)?

Accepted Answer

1750 J

Answer

70 J

Answer

355 J

Answer

175 J

Question 8

A bulldozer does 30,000 J of work over a distance of 20 meters. How much force did it apply?

Accepted Answer

1500 N

Answer

2000 N

Answer

1000 N

Answer

2500 N

Question 9

What is the definition of power?

Accepted Answer

Power is the rate at which work is done.

Answer

Power is the product of force and velocity.

Answer

Power is the product of force and work done per unit time.

Answer

Power is the product of force per unit time and velocity.

Question 10

A 5000N block is lifted 10 m. Calculate the work done.

Accepted Answer

50000 J

Answer

5000 J

Answer

500 J

Answer

50 J

Question 11

How much force is used when 350 J is produced to move a car 5 m?

Accepted Answer

70 N

Answer

17500 N

Answer

355 N

Answer

175 N

Question 12

A man carries a box across a room at constant velocity. Is work being done on the box by the man?

Accepted Answer

No

Answer

Yes

Answer

Half of the time

Answer

Not enough information

Question 13

A 16 N force is applied to an object and 96 J of work is done. How far was the object moved?

Accepted Answer

6 m

Answer

16 m

Answer

80 m

Answer

1536 m

Question 14

If two rocks are launched through the air at the same speed, but one has twice as much mass as the other, how do their kinetic energies compare?

Accepted Answer

The rock with the greater mass has more kinetic energy than the rock with less mass even though they are traveling at the same speeds because both mass and speed affect kinetic energy.

Answer

The kinetic energy of the two rocks is the same because they have the same speed

Answer

The rock with the greater mass will only move a small distance and then fall straight to the ground

Answer

The two rock could not have the same speed if they have different masses

Question 15

Which point has the most kinetic energy?

Accepted Answer

Ball D

Answer

Ball G

Answer

Ball F

Answer

Ball E

Answer

Ball A

Question 16

Which of the following is a true statement about work?

Accepted Answer

It measures how much effort is applied over a certain distance

Answer

It measures how quickly an object accelerates

Answer

It measures the change in an object's rate of speed

Answer

It measures how much time it takes to move a massive object

Question 17

Simple machines make work easier by increasing what?

Accepted Answer

The distance over which work is done

Answer

The force needed to do work

Answer

The time required to do work

Answer

The acceleration of a massive object

Question 18

An object has 12.4 J of potential energy and 23.5 J of kinetic energy. What is the mechanical energy of the system?

Accepted Answer

35.9 J

Answer

11.1 J

Answer

1.895 J

Answer

291.4 J

Question 19

As a pendulum swings from its highest to lowest position, what happens to its kinetic and potential energy?

Accepted Answer

The potential energy decreases while the kinetic energy increases

Answer

Both the potential energy and kinetic energy decrease

Answer

The kinetic energy decreases while the potential energy increases

Answer

Both the potential energy and kinetic energy increase

Question 20

An Olympic high jumper, with a mass of 82 kg, has a maximum gravitational potential energy of 1970 J. How high was the jump?

Let g = 9.8N/kg

Accepted Answer

2.5 m

Answer

24 m

Answer

161,540 m

Answer

201 m

Question 21

One of the tallest radio towers is in Fargo, North Dakota. The tower is 629 m tall. If a bird lands on top of the tower, so that the gravitational potential energy associated with the bird is 2033 J, what is its mass?

Let g = 9.8N/kg

Accepted Answer

0.330 kg

Answer

1,278,757 kg

Answer

12,531,819 kg

Answer

3.25 kg

Answer

0.309 kg

Question 22

A 15 kg object is lifted to a height of 5 meters. What is the gravitational potential energy of the object? (Use $$g = 9.8 \, ext{m/s}^2$$ )

Accepted Answer

735 J

Answer

75 J

Answer

150 J

Answer

980 J

Question 23

Which of the following statements best describes the concept of work in physics?

Accepted Answer

Work is the energy transferred to or from an object via the application of force along a displacement.

Answer

Work is the energy stored in an object due to its position.

Answer

Work is the energy an object has due to its motion.

Answer

Work is the rate at which energy is transferred or converted.

Question 24

A car engine does 5000 J of work in 10 seconds. What is the power output of the engine?

Accepted Answer

500 W

Answer

50 W

Answer

5000 W

Answer

5 W

Question 25

If a force of 100 N is applied to move a box 4 meters across a floor, how much work is done on the box?

Accepted Answer

400 J

Answer

25 J

Answer

104 J

Answer

500 J

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