Energy and Power Practice

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

• 11.1 J

• 1.895 J

• 35.9 J

• 291.4 J

Tags

NGSS.HS-PS3-1

Where would a car traveling on a roller coaster track have the most potential energy?

• At the bottom

• Halfway to the top

• at the top

• halfway to the bottom

• It is always the same

Tags

NGSS.HS-PS3-2

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

• Both the potential energy and kinetic energy decrease

• The potential energy decreases while the kinetic energy increases

• The kinetic energy decreases while the potential energy increases

• Both the potential energy and kinetic energy increase

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

A person weighing 600 N gets on an elevator. The elevator lifts the person 6 m in 10 seconds.  How much power was used?

• 360 W 
• 60 W
• 3600 W
• 600 W

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

P=25 watts 
W=5000 Joules 
t=???

• 200 sec
• 0.0005 s
• 125000 s
• 125 s

Tags

NGSS.HS-PS3-1

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

Tags

NGSS.HS-PS2-1

In the figure, potential energy is being converted into kinetic energy from

• point A to point B

• point B to point C

• The only energy involved here is kinetic.

• Energy is not being converted.

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-3

If the roller coaster has a mass of 50 kg and at point A, where it is at rest, is 10 m above the ground, what is the kinetic energy at point B, where height = 0?

• 0 J

• 15 J

• 50 J

• 500 J

An apartment building has two floors and a basement. The floors are 3.5 meters apart and the basement is 2.5 meters underground as shown.

The man’s 50 kg son is in the basement doing laundry. How much gravitational potential energy does the son have relative to his father on the second floor? Use g = 10 m/s².

• -3000 J

• -300 J

• 300 J

• 3000 J

Tags

NGSS.HS-PS3-1

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

• mechanical

• chemical

• thermal

• combined

Tags

NGSS.MS-PS3-4