Work, Power, and Energy

A boy does 18 J of work in 2 s on his backpack as he lifts it from a table.

How much power did the boy use on the backpack?

( Include your units!)

You do work when you mannequin pose with an object in your hand.

• True

• False

Work divided by time equals...

• energy
• power

The unit used to measure power is the 

• Watt
• Newton
• Joule
• Newton*meter

How much time is needed to produce 720 Joules of work if 90 watts of power is used? 

• 0.125 s
• 8 s
• 64800 s
• 80 s

Two factors that determine work are...

• Force

• Mass

• Velocity

• Distance

True or false
You do work only when you exert a force on an object and move it

• true
• false

work is a measurement of how much force is applied over a certain

• distance
• velocity
• shape
• size

units for work are

• netwons
• joules
• meters
• seconds

work transfers

• sweat
• energy
• velocity
• effort