Work, Machines, Energy Review

What is the SI unit equivalent for 1 N-m

• watt
• joule
• m/s

The work that a person does to a machine is known as 

• power
• work input
• work output

Mechanical efficiency is always less than 100% due to 

• work
• power
• friction

A simple machine that has a bar pivoting on a fulcrum is a

• wedge
• screw
• lever

What family does a pulley belong to?

• incline plane
• lever
• pulley

_____ mechanical advantage is always higher than ____ mechanical advantage.

• ideal, actual
• actual, ideal
• work, power

The rate at which work is done is called

• mechanical efficiency
• mechanical advantage
• power

Friction impacts

• actual mechanical advantage
• ideal mechanical advantage
• power

If I lift an identical stack of candy bars the same distance on a table as you do, but you do it twice as fast your actions would involve twice as much

• power
• efficiency
• work output

Three simple machines that belong to the inclined plane family are

• the lever, inclined plane and pulley
• the screw, the inclined plane and wedge
• the lever, wedge, and wheel and axle