IV. The numbers draw lever

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IV. The numbers (draw lever)

• 1. Input force (Fi)--force applied to machine
• 2. Output force (Fo)--force produced by machine
• 3. Input distance (di)--distance of input force
• 4. Output distance (do)--distance of output
  force

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• 5. Work input--work put into the machine
  Win Fi x di
• 6. Work output--work done by the machine
  Wout Fo x do
• 7. Wout always less than Win
• because of friction

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V. Mechanical Advantage

• A. The number of times the input force gets
  multiplied

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• B. Ideal mechanical advantage
• Neglects friction
• IMA input distance di
• output distance do

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• C. Actual Mechanical Advantage
• Includes friction
• AMA output force Fo
• input force Fi

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VI. Efficiency

• A. Some work is always lost to friction
• B. People always put more work into a machine
  than they get out of it.
• C. Machines make work easier they do not make
  less work!!!!!!!

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• Efficiency measures how much of the work input
  turns into work output
• Eff work output x 100
• work input