Work, Energy, Power

Which of the following is defined as an energy transfer?

• kinetic energy

• work

• potential energy

• chemical energy

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NGSS.MS-PS3-3

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A light plastic cart and a heavy steel cart are both pushed with the same force for a distance of 1.0 m, starting from rest. After the force is removed, the kinetic energy of the light plastic cart is ________ that of the heavy steel cart.

• greater than

• equal to

• less than

• can't say unless we know how big the force is

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NGSS.MS-PS2-1

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NGSS.MS-PS3-1

NGSS.MS-PS3-5

Four students run up the stairs in the time shown. Which student has the largest power output?

• A

• B

• C

• D

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NGSS.MS-PS3-1

NGSS.MS-PS3-5

How much work is done on a 200-kg crate that is hoisted 2 m in a time of 4 s?

• 400 J

• 1000 J

• 1600 J

• 4000 J

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NGSS.MS-PS3-4

NGSS.MS-PS3-5

How much power is required to raise a 200-kg crate a vertical distance of 2 m in a time of 4 s?

• 400 W

• 1000 W

• 1600 W

• 4000 W

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NGSS.MS-PS3-5

Power is defined as the quantity that measures the rate at which _____ is done or energy is transformed.

• energy

• time

• work

• elasticity

How much time is needed to produce 720 Joules of work if 90 watts of power is used? 

• 0.125 s

• 8 s

• 64800 s

• 80 s

An 8-kg object is raised by a crane to the top of a building 20-meters in height. If it takes 50 seconds for the object to get to the top of the building, then how much power was needed?

• 1600 watts

• 3.2 watts

• 32 watts

• 200 watts

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NGSS.MS-PS3-2

NGSS.MS-PS3-4

If an MMA fighter uses 40 Newtons of force to punch a bag 0.5 meters in 2 seconds, how much power was created? 

• 10 Watts

• 1 Watts

• 20 Watts

• 40 Watts

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NGSS.MS-PS3-5

A roller coaster whose average speed is 32 m/s is at the top of a 72m hill and weighs 966N. At the top of the hill the coaster car has ___________________ energy.

• only kinetic energy

• only potential energy

• mostly kinetic energy

• both kinetic and potential energy

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-2