Work, Power, & Energy

Energy is

• how fast you do something.

• the ability to do work.

• confusing.

• how fast you lift something.

If you use 30 J of energy to move an object, you have done ____ J of work.

• 3

• 10

• 30

• 0

Tags

NGSS.HS-PS2-1

Jane carries a 5 kg box and Lorie carries a 10 kg box up a set of stairs, who did more work?

• Jane because his box was lighter.

• Lorie because her box weighed more.

• Can't tell.

If you lift a box that is twice as heavy as your friend you are doing

• the same amount of work.

• two times more work than your friend.

• half as much work as your friend.

• Cannot be determined.

You push a crate with a force of 100 N for 5 meters. How much work did you do?

• 500 J

• 100 J

• 50 J

• 5 J

How much power is generated by Ashley (50 kg) running up a 6 m flight of stairs in 5 seconds?

• 60 W

• 62 W

• 600 W

• 1500 W

Tags

NGSS.HS-PS2-1

NGSS.HS-PS3-1

Work is done only if

• a force is applied.

• the force applied causes the object's motion.

• an object is in motion.

If you carry a 5 kg box across the room at a constant velocity

• you do no work.

• you do some work.

• you do negative work.

• Cannot be determined.

On a work vs time graph, you can calculate the power by

• the area.

• the y-axis.

• the y-intercept.

• the slope.

How much power was generated from 0-4 seconds?

• 1100 W

• 4 W

• 267 W

• 1600 W