Chapter 14 Work, Power, and Machines Vocab

Work is the product of 

• speed and force
• force and distance
• power and force
• motion and force

Which of the following is a unit of work?

• joule
• watt
• horsepower
• newton

How much work in J, is done when a 20.0 N force moves an object 2.5 m?

• 50 J

• 22.5 J

• 2.5 J

• 2 J

Power is equal to work divided by 

• time
• force 
• mechanical advantage
• distance

If a machine has a mechanical advantage much larger than 1, its output force is

• much larger than its input force 
• much less than its input force
• about the same as its input force
• in the same direction as its input force

How is the work output of a machine related to its work input?

• always less
• always equal 
• always greater
• always zero

A machine with a 8-N input force and a 25-N output force has a mechanical advantage of

• 3.13
• 200
• 0.32
• 25

Tags

NGSS.MS-PS2-2

A screw can be considered a type of 

• lever
• pulley
• inclined plane
• compound machine

Which is not a simple machine?

• wedge
• lever
• screw
• fulcrum

The mechanical advantage of a pulley system depends upon

• the diameter of the pulley wheels 
• the length of the rope
• the number of sections of rope
• the direction of the input force