Work, Energy, Power, and Conservation of Energy

1.

Multiple Choice

15 mins

1 pt

A 60.0 kilogram student climbs a ladder a vertical distance of 4.00 meters in 8.00 seconds. Approximately how much total work is done against gravity by the student during the climb?

2.40 x 10³ J

3.00 x 10³ J

2.90 x 10² J

2.40 x 10² J

2.

Multiple Choice

2 mins

1 pt

If 68 Joules were necessary to move a 4 Newton crate, how far was the crate moved?

272 m

17 m

4.05 m

272 cm

3.

Multiple Choice

15 mins

1 pt

A child applies a constant 20 newton force along the handle of a wagon which makes an angle of 25^o with the horizontal. How much work does the child do in moving the wagon a horizontal distance of 4.0 meters?

34 J

80 J

73 J

5.0 J

4.

Multiple Choice

3 mins

1 pt

A car travels at a constant speed, v, up a hill from point A to point B. As the car travels from A to B, its gravitational potential energy __________________.

increases and its kinetic energy remains the same

remains the same and its kinetic energy decreases

increases and its kinetic energy decreases

remaines the same and its kinetic energy remains the same.

5.

Multiple Choice

15 mins

1 pt

While riding a chairlift, a 55-kg skier is raised a vertical distance of 370 m. What is the total change in the skier's gravitational potential energy?

5.4 x 10¹ J

5.4 X 10² J

2.0 X 10⁴ J

2.0 X 10⁵ J

6.

Multiple Choice

15 mins

1 pt

In which scenario is work = 0 J?

Pushing a stationary wall

Pulling a trolley car

Pushing a book across the table

Dropping a set of keys from a height

7.

Multiple Choice

15 mins

1 pt

The table below lists the mass and speed of four objects. Which two objects have the same KE?
Objects | Mass | Speed
A | 1.0 kg | 4.0 m/s
B | 2.0 kg | 2 .0 m/s
C | 0.5 kg | 4.0 m/s
D | 4.0 kg | 1.0 m/s

A and C

B and C

A and D

B and D

8.

Multiple Choice

15 mins

1 pt

The work done in accelerating an object along a frictionless horizontal surface is equal to the change in the object's ____________.

potential energy

momentum

kinetic energy

velocity

9.

Multiple Choice

15 mins

1 pt

A horizontal force of 5.0 newtons acts on a 3.0 kg mass over a distance of 6.0 meters along a horizontal, frictionless surface. What is the change in kinetic energy of the mass during its movement over the 6.0 meter distance?

90 J

30 J

15 J

6.0 J

10.

Multiple Choice

15 mins

1 pt

A 3 kg plate is tossed across the room with an acceleration of 13 m/s² in 2.5 sec. Calculate the amount of power it took to toss the plate.

290.5 W

1267.5 W

507 W

3000 W

11.

Multiple Choice

15 mins

1 pt

Student A lifts a 50-N box from the floor to a height of .40 meters in 2.0 seconds. Student B lifts a 40 N box from the floor to a height of .50 meter in 1.0 second. Compared to student A, student B does ___________________.

more work but develops less power

the same work but develops more power

less work but develops more power

the same work but develops less power

12.

Multiple Choice

30 sec

1 pt

Which has the most kinetic energy?

a basketball rolling down a hill

a bus stopped at the top of a hill

a dump truck driving down a hill

a golf ball sitting at the top of the hill

13.

Multiple Choice

30 sec

1 pt

Potential energy that depends on height is called

Kinetic energy

Elastic potential energy

Nuclear energy

Gravitational potential energy

14.

Multiple Choice

30 sec

1 pt

What is mechanical energy?

It is what metal creates when heated.

All potential and kinetic energy in a system.

It is motion of all matter.

Energy of momentum.

15.

Multiple Choice

30 sec

1 pt

What form of energy does a compressed spring have?

heat energy

kinetic energy

chemical energy

potential energy

16.

Multiple Choice

30 sec

1 pt

What type of energy is in this picture?

Kinetic

Potential

Chemical

Sound

17.

Multiple Choice

5 mins

1 pt

How much kinetic energy (KE) does a baseball with a mass of 0.143 kg have if it is traveling at a velocity of 41.1 m/s?

120.8 joules

89.7 joules

108.3 joules

156.6 joules

18.

Multiple Choice

3 mins

1 pt

A 60.0-kg ball of clay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest point?

0 J

635 J

280 J

2700 J

19.

Multiple Choice

3 mins

1 pt

A box of old textbooks is on the middle shelf in the bookroom 1.3 m from the floor. If the janitor relocates the box to a shelf that is 2.6 m from the floor, how much work does he do on the box? The box has a mass of 10 kg.

13 J

26 J

130 J

260 J

20.

Multiple Choice

30 sec

1 pt

The rock in the picture is pushed over the edge and it begins to fall. Which type of energy conversion is taking place?

mechanical to heat

sound to mechanical

potential to kinetic

kinetic to potential

21.

Multiple Choice

30 sec

1 pt

At which point(s) on the roller coaster is the gravitational potential energy at its maximum?

A

B

C

D

22.

Multiple Choice

30 sec

1 pt

At which point(s) on the roller coaster is the kinetic energy at its maximum?

A

B

C

D

23.

Multiple Choice

30 sec

1 pt

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?

411,600 J

294,000

176,400 J

117,600 J

24.

Multiple Choice

30 sec

1 pt

In diagram 2, if the 600 kg cart is initially at rest, what is its velocity at point B?

19.8 m/s

15.0 m/s

10.3 m/s

3.8 m/s

25.

Multiple Choice

30 sec

1 pt

A cliff diver with a mass of 125 kg jumps off a 50m high cliff, how fast will he be traveling just before he hits the water? (HINT: Find PE first.)

61,250 m/s

980 m/s

31.3 m/s

247.5 m/s

26.

Multiple Choice

30 sec

1 pt

If a ball has a height of 10 m and a mass of 0.5 kg, what will be it's KE after it has fallen halfway to a height of 5m?

5.10 J

2.55 J

10.2 J

12.5 J

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