What is Efficiency?

Question 1

friction

Answer 1

• the opposing force one object exerts on another when they touch

Question 2

machine

Answer 2

• a device that can make work more effective… easier

Question 3

work input

Answer 3

• amount of work put into a machine

Question 4

work output

Answer 4

• amount of work done by the machine

Question 5

efficiency

Answer 5

• ratio of work input to work output
• expressed as a percent
• higher the %, higher the efficiency

Question 6

ideal machines…

Answer 6

• are 100% efficient
• Lose NO work to friction
• Do not exist