Work is done when a _____ is exerted on an object and the object moves a _____.

Work =

When you hold something, are you exerting a force on the object?

When you hold something, are you doing work?

If you set the object on a table, does the table exert a force on the object?

___cannot be greater than ___ due to friction.

___cannot be greater than ___ due to friction.

___the ratio of work output to work input.

____the rate at which work is done.

A father lifts his daughter repeatedly in the air. How much work does he do with each lift, assuming he lifts her 2.0 m and exerts an average force of 190 N?

If two objects do the same amount of work, but one does it in less time.

A watt is the amount of power required to

A weight lifter does 686 J of work on a weight that he lifts in 3.1 seconds. What is the power with which he lifts the weight?

Mechanical advantage is

A roofer needs to get a stack of shingles onto a roof. Pulling the shingles up manually used 1549 N of force. Using a system of pulleys requires 446 N. What is the mechanical advantage?

What is the efficiency of a machine if 55.3 J of work are done on the machine, but only 14.3 J of work are done by the machine?

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