ECP Chapter 9: Work, Power, & Energy Review

The unit of power is the...

• work
• watt

The unit of work is the ...

• joule
• force

Tags

NGSS.HS-PS3-2

Work is done on an object when the object moves in the SAME direction in which the force is applied.

• True
• False

The FARTHER you move an object, the more work you do.

• True
• False

Tags

NGSS.MS-PS3-5

The more POWER you use to move an object, the more work you do. 

• True
• False

Power is the RATE at which work is done. 

• True
• False

A kid applies a force of 70 N to a ball over 1.1 meters. How much work did he do on the ball? 

• 77 J
• 7.7 J 
• 0.7 J 
• 770 J 

Tags

NGSS.HS-PS3-2

A weightlifter lifts two 300 newton weights 1.5 meters off the ground. How much work has he done?

• 600 J 
• 660 J
• 900 J 
• 1200 J 

Tags

NGSS.HS-PS3-1

You move a 12-newton box up a 6-meter ramp. In order to find out how much power you created, what would you need to know?

• The mass of the box
• The slope of the ramp 
• The direction the box moved
• How long the task took

Tags

NGSS.HS-PS3-1

You do 90 joules of work in 30 seconds. How much power have you generated?

• 30 watts
• 3 watts
• 120 watts
• 270 watts