Work, Energy, Power

Which of the following is defined as an energy transfer?

• kinetic energy

• work

• potential energy

• chemical energy

Tags

NGSS.HS-PS3-4

The unit of work is

• watt

• hertz

• joule

• pascal

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

Tags

NGSS.HS-PS2-1

Each of the boxes shown is pulled for 10 m across a level, frictionless floor by the force given. Which box experiences the greatest change in its kinetic energy?

• A

• B

• C

• D

• E

Tags

NGSS.HS-PS3-1

NGSS.HS-PS2-1

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

• A

• B

• C

• D

A major league pitcher can throw a baseball with a kinetic energy of 150 J. How much work must the pitcher do to the ball to give it that much KE?

• 150 J

• 0

• Can’t tell without knowing the mass of the ball

Tags

NGSS.HS-PS3-1

What is the unit for power?

• what

• watt

• joule

• Jewel-Osco

Which requires more work – a person walking up stairs or a person running up stairs?

• walking

• running

• they require equal work

• no work is required for either because the movement is vertical

Which requires more power – a person walking up stairs or a person running up stairs?

• walking

• running

• they require equal power output

• no power is required at all

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

Tags

NGSS.HS-PS3-1