PSc. 3.1.4

A ______________ is a rope or chain wrapped around a wheel. 

• wedge 
• lever 
• pulley 
• screw

Any device that makes work easier is called a ______________________.

• Joule 
• prop
• lever
• machine

The unit used to measure power is the 

• Watt
• Newton
• Joule
• Newton*meter

A simple machine with a straight slanted surface is a(n) __________________. 

• lever
• wheel and axle
• inclined plane
• pulley

No machine in existence has 100% efficiency due to ____________________.

• magic
• friction
• smoke
• input

A drill bit is an example of which machine?

• screw
• pulley
• ramp
• wedge

A 5000N block is lifted 10 m. How much work was done?

• 50000 J
• 5000 J
• 500 J
• 50 J

If a pulley has a mechanical advantage of 3. How much force is needed to lift a resistance of 90 N? 

• 3N
• 90N
• 180N
• 30N

How much work is produced when 350 N is used to move a car 5 m?

• 70 J
• 1750 J
• 355 J
• 175 J

If 68 Joules were necessary to move a 4 Newton crate, how far was the crate moved?

• 272 m
• 17 m
• 4.05 m
• 272 cm