Work, Energy, Power, Impulse, and Momentum

A student moves a 1.50 kg book from a shelf 2.00 meters high to a shelf 1.20 meters high.

What is the approximate magnitude of the change in the gravitational potential energy of the

book?

• 4.50 J

• 12.0 J

• 18.0 J

• 30.0 J

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-1

A metal pot holding water is being warmed on an electric stove burner. Which of the

following statements BEST explains how the first law of thermodynamics applies to the

water in the pot?

• energy of the water = energy from the burner - work done on surrounding

• energy of the water = energy from the burner + work done on surrounding

• energy of the water = energy from the burner - heat loss due to friction

• energy of the water = energy from the burner

A ball is dropped from a window and bounces three times. The first bounce is 60 centimeters high. The second bounce is 40 centimeters high. The third bounce is 15 centimeters high.

The ball then rolls and comes to a stop.

What has happened to the energy of the ball when it has come to a stop?

• The potential energy of the ball has decreased.

• The kinetic energy of the ball has increased.

• The potential energy has been transformed into kinetic energy.

• The potential energy of the ball has increased during energy transfer.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

The table below lists the power ratings of several household devices, and how long members

of your household operate them one day.

guitar amplifier

180 W

40 minutes

DVD player

15 W

9 hours 30 minutes

hair dryer

1.875 kW

4 minutes 30 seconds

toaster oven

1.50 kW

6 minutes

• guitar amplifier

• DVD player

• hair dryer

• toaster oven

Tags

NGSS.HS-PS3-1

A 1000 kg car accelerates from 2.0 m/s to 6.0 m/s in 5.0 s. What is the magnitude of the

car’s final momentum?

• 0.8 kg x m /s

• 800 kg x m /s

• 4000 kg x m /s

• 6000 kg x m /s

Tags

NGSS.HS-PS2-2

A truck with a mass of m

collides inelastically with a car with a mass of m. The velocity of the truck is v, and the car is at rest. In terms of the given quantities, what is the final momentum of the system?

• M_tV / (M_t+M_c)

• M_t V + M_cV

• M_cV

• M_tV

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

A steel ball, a rubber ball, a wet ball of clay, and a golf ball of the same mass are dropped from rest 10.0 m above the ground. The steel ball rebounds from the ground at a speed 1/4 of its impact speed, the rubber ball rebounds with a speed 3/4 of its impact speed, the wet ball of clay sticks to the ground and comes to rest, and the golf ball rebounds with a speed of 1/2 its impact speed. Which ball received the greatest impulse from the ground?

• steel ball

• rubber ball

• clay ball

• golf ball

Tags

NGSS.HS-PS2-2