Machine Efficiency

Efficiency is a ratio which tells how well a machine works.

• true

• false

Tags

NGSS.MS-PS3-3

Real machines:

• actually exist

• have an efficiency less than 100%

• lose energy due to friction

• all are correct

Tags

NGSS.MS-ETS1-1

NGSS.MS-PS3-5

In real simple machines, work output is work:

• done on the machine

• done by the machine

• that is 100% efficient

• that is over 100% efficient

What is it called when something equals the output work divided by the input work; expressed as a percentage.

• outside work

• input work

• efficiency

• data

The ratio of the output work to the input work.

• mechanical advantage

• efficiency

• simple machine

• compound machine

• inclined plane

What is the efficiency of the machine if the input is 263 J and the output is 142 J?

• 6.26%

• 54%

• 100%

• 260%

True or False: No machine is 100 % efficient.

• True

• False

Which of the following best describes machine efficiency?

• The ratio of input work to output work

• The ratio of output work to input work

• The difference between input and output work

• The sum of input and output work

A machine has an input work of 500 J and an output work of 350 J. What is its efficiency?

• 70%

• 75%

• 80%

• 85%

Tags

NGSS.MS-PS3-5

Which factor does NOT affect the efficiency of a machine?

• Friction

• Material of the machine

• Shape of the machine

• Color of the machine

Tags

NGSS.MS-PS2-2