Power and Work Review

It takes 20 N of force to move a box a distance of 10 m. How much work is done on the box ?

• 20J

• 30J

• 200J

• 20

Two factors that determine work are

• amount of force and effort used

• mass and distance

• amount of force and type of force

• amount of force and distance moved

You apply a force of 18 N to a dresser and move it 3.0 m. How much work did you do on the dresser?

• 54 N

• 54

• 54 J

• 21 J

Tags

NGSS.HS-PS3-1

The unit or label for work is

• Newtons

• meters

• Force

• Joules

Ms. McDonald holds a desk perfectly still above her head. If she holds the desk at a height of 0.5 meters above her head, and applies 68 Newtons of force to do so, how much work has she done?

• 34J

• 340J

• none

• 68.5J

Tags

NGSS.HS-PS3-2

You do work when

• you exert a force on an object but the object does NOT move.

• you exert a force on an object and it moves in the opposite direction of your force.

• you exert a force on an object that causes it to move in the same direction as the force

• the object moves, but no force is applied.

Tags

NGSS.HS-PS2-1

What is the formula for work?

• output work/input work X 100%

• input force/output force

• work/time

• force x distance

Which of the following IS NOT an example of work being done?

• Pushing a cart in a store

• A stand off in tug of war

• Shooting a basketball

• Running a mile

Which of the following is an example of work being done?

• Teacher sitting in a chair

• Keys hanging from a key chain

• Book resting on desk

• A ball being rolled on the floor

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

True or False: As a man pushes a refrigerator up a ramp, work is done.

• true

• false