Work, Power and Energy

If you lift a box from the floor to a height of 1m and then carry the for for 10m, you do work only when you CARRY the box.

• True

• False

Power is the RATE at which work is done. 

• True

• False

What is needed to calculate work?

• force

• distance

• time

• mass

A force applied on a block accelerates across a horizontal, frictionless surface. The energy gained by the block is equal to which?

• the momentum given to the block

• the work done on the block

• the power applied to the block

• the impulse applied to the block

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS3-5

____ is being done when a force is exerted on a wagon while it is being pulled up a hill.

• Power

• Force

• Work

Tags

NGSS.MS-PS3-4

You use 950 J of energy to push a sofa. If it took you 5 sec to move the sofa, what was your power?

• 190 J

• 4750 J

• 4750 W

• 190 W

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

If 360 J of work is needed to move a crate a distance of 4 m, what is the weight of the crate?

• 90 N

• 720 N

• 90 kg

• 720 W

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

A runner exerts 240,000 J when she runs for 10 min. What is the runner's power?

• 400 W

• 600 W

• 400 J

• 600 J

Tags

NGSS.MS-PS3-5

A box is pushed across the floor a distance of 8 m with a force of 55 N in 7 s. What is the work done?

• 440 J

• 440 W

• 62.9 J

• 62.9 W

The power rating of an electric lawnmower is 3000 W. If the lawnmower is used for 60 sec, how many joules of work can it do?

• 270,000 W

• 270,000 J

• 180,000 J

• 33.3 W

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

NGSS.MS-PS3-5