Dasha's Calculating Efficiency Page

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Dasha's Calculating Efficiency Page
Here are links to my other pages
~Home Page~ Work Input-Work Output~ Friction ~ Practice-Quiz~ Practice-Quiz Answer~ Bibliography~

external image MechanicalEfficiency.gif

STEPS ON CALCULATING:
1. First you take the output |work (Wout), which would be the weight of the object you are trying to move multiplied by the height/distance you are trying to move it.

2. Then you take the input work (Win), which would be the force you used to move the object multiplied by how much distance/height you needed to complete the task.

3. Next you take the Wout and divide it by Win.

4. Lastly you could either leave the number like that or multiply it by 100 to get a percentage.

REMEMBER:
  • ME= Wout/Win x 100
  • Wout = weight of object x height
  • Win = force applied x distance used
  • Use Jules (J) for Wout and Win answers
  • The energy wasted is the rest of the percentage from the answer
  • The force of gravity acting on the object is the same as the weight of the object

Here is a short video on how to calculate efficiency.....................


Notes on Calculating
  • When you calculate the mechanical efficiency in percentage the rest of the percentage not shown would be the amount of work wasted on friction. In order to increase the mechanical efficiency you must reduce the friction. For example if you get 80% for your efficiency then 20% would be the amount of work wasted on friction or the amount of input work transformed into heat energy.

If you want to practice calculating efficiency go to the practice test page.