Using Machines

The _____________ of a machine is the ratio of the output work to the input work.

• Weight

• Time

• Efficiency

• Base

The ideal mechanical advantage, or _________, is the mechanical advantage if no friction existed.

• IMA

• MIA

• IAM

• AIM

Machines cannot operate at ideal mechanical advantage because ___________ always exists.

• Weight

• Time

• Limits

• Frictions

Because output work is always less than input work, a machines efficiency is always less than ______ percent.

• 1

• 200

• 100

• 150

You can ______________ the efficiency of a machine by maintaining and lubricating its moving parts.

• Increase

• Copy

• Decrease

• Lower

A mechanical advantage greater than _____ means the output force is greater than the input force.

• 5

• 2

• 4

• 1

You input 100 J of work to a machine that gives

50 J of work output.

What is the machine's efficiency? 

• 0.5 %

• 50%

• 200 %

• 5000%

You push down on a lever with a force of 100 N to lift a 500 N box.

What is the mechanical advantage of the machine? 

• 500

• 100

• 5

• 0.2

Tags

NGSS.MS-PS2-2

The force applied on the can is 30 N

when you twisted the can opener with 10 N

What is the mechanical advantage of the machine? 

• 40

• 30

• 10

• 3

What is the efficiency of a machine if 55.3 J of work are done on the machine and 14.3 J is produced by the machine?

• 0.25 J

• 26%

• 386%

• 3.86 J