simple machines and the body

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5 Terms

1
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machines provide us a

  • mechanical advantage, MA, to help us do work - by multiplyig our force of giving us a speed or distance advantage

  • ideal MA (mechanical advantage) excludes the effect of friction

2
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machine advantage

  • W = weight moved

  • E = effort put in

<ul><li><p>W = weight moved</p></li><li><p>E = effort put in</p></li></ul>
3
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work

  • equals force times distance

4
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energy if no friction

  • energy is conserved, therefore, input work = output work

<ul><li><p>energy is conserved, therefore, input work = output work</p></li></ul>
5
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force and distance of a machine

  • the force times distance put into the machine is equal to the force times distance you move the resistance

  • WITH FRICTION: your input has to be greater than the output because some turns to thermal energy

  • if you can use less force to move a larger object, ou will have to move a larger distance than the object moves.