Energy, Work, and Power Review

What are two things required for work to be done? Check all that apply.

• Force

• Distance

• Constant Speed

• Momentum

How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes?

• 15 J
• 45 J
• 0 J
• 5 J

If 150 Joules of work is needed to move a box 10 meters, what force was used? 

• 1500 N
• 15 N
• 1.5 N
• 150 N

How much work must be done to lift a 50 kg barbell 2.5 m above the floor?

• 125 J

• 300 J

• 3062.5 J

• 1225 J

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

• A

• B

• C

• D

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

A roller coaster completes the following course. If the roller coaster car starts from rest at point A, what is the speed of the car at point C?

• 24 m/s

• 30 m/s

• 10 m/s

• 100 m/s

Starting from rest, a marble first rolls down a steeper hill, then down a less steep hill of the same height. Ignoring friction, for which is it going faster at the bottom?

• Faster at the bottom of the steeper hill

• Faster at the bottom of the less steep hill

• Same speed at the bottom of both hills

• Can’t say without knowing the mass of the marble

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A student with a mass of 62 kg walks up a flight of stairs with a height of 3.4 meters. How can he decrease his power?

• walk slower

• walk faster

• carry his friends books

A student with a mass of 62.0 kg walks up a flight of stairs with a height of 3.40 meters. If it takes him 7.00 seconds to get to the top, how much power did he generate?

• 30.1 W

• 295 W

• 2070 W

A spring with spring constant 4 N/m is compressed by 0.25 m. How much energy is stored in the spring?

• 1 J

• 0.25 J

• 0.125 J

• 0.5 J

Tags

NGSS.HS-PS3-1