What is Efficiency? Flashcards Preview

Physical Science Grade 8 (Acellus) > What is Efficiency? > Flashcards

Flashcards in What is Efficiency? Deck (6)
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1
Q

friction

A
  • the opposing force one object exerts on another when they touch
2
Q

machine

A
  • a device that can make work more effective… easier
3
Q

work input

A
  • amount of work put into a machine
4
Q

work output

A
  • amount of work done by the machine
5
Q

efficiency

A
  • ratio of work input to work output
  • expressed as a percent
  • higher the %, higher the efficiency
6
Q

ideal machines…

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

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