Win= 2000J ME= Wout/Win ME= 1600J/2000J ME= 80% The Mechanical Efficiency is 80%. 2) Wout= F x d Wout= 10 000N x 5m Wout= 50 000J
Win= F x d
Win= 7000N x 12m
Win= 84 000J EW= Win - Wout EW= 84 000J - 50 000J EW= 34 000J The Energy wasted is 34 000J. 3)Wout= F x d Wout= 495N x 13m Wout= 6435J
Win= F x d
Win= 385N x 25m
Win= 9625J ME= Wout/Win x 100% ME= 6435J/9635J x 100% ME= 66.9% The Mechanical Efficiency of this machine is 66.9%. 4) Work input- the total work a machine does. Work output- the useful work a machine does. 5) The efficiency of a machine is never 100% because some of the force goes to over coming the force of friction and some is also turned into heat and sound energy.
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1) Wout= F x d
Wout= 400N x 4m
Wout= 1600J
Win= F x d
Win= 250N x 8m
Win= 2000J
ME= Wout/Win
ME= 1600J/2000J
ME= 80%
The Mechanical Efficiency is 80%.
2) Wout= F x d
Wout= 10 000N x 5m
Wout= 50 000J
Win= F x d
Win= 7000N x 12m
Win= 84 000J
EW= Win - Wout
EW= 84 000J - 50 000J
EW= 34 000J
The Energy wasted is 34 000J.
3)Wout= F x d
Wout= 495N x 13m
Wout= 6435J
Win= F x d
Win= 385N x 25m
Win= 9625J
ME= Wout/Win x 100%
ME= 6435J/9635J x 100%
ME= 66.9%
The Mechanical Efficiency of this machine is 66.9%.
4) Work input- the total work a machine does.
Work output- the useful work a machine does.
5) The efficiency of a machine is never 100% because some of the force goes to over coming the force of friction and some is also turned into heat and sound energy.
| What is Mechanical Efficiency | Practice test | Practice Test Answers| Bibliography |