Chapter 14 Quiz 2

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

Which of the following is the best example of work being done. 

• doing homework
• lifting a box
• pushing a stationary box
• holding a box

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

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

What type of inclined plane has the greater mechanical advantage?

• Higher.
• Flatter.
• Oiled.
• Sticky. 

 Work done = Force x _________

• a. distance
• b. acceleration
• c. velocity
• d. speed

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

• 70 J
• 1750 J
• 355 J
• 175 J

In which of these cases is work being done? 

• A student sleeps
• A student pushes a locked door that does not move
• a student carries his chair into another room
• A student sits on the carpet