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Levers

Levers. M echanical Advantage. Classes of Levers. We often use machines to make jobs easier for us. Machines do this by: reducing the force we use (offering a force advantage) MA > 1 doing the job faster (offering a speed advantage) MA < 1. Mechanical Advantage.

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Levers

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  1. Levers MechanicalAdvantage

  2. Classes of Levers • We often use machines to make jobs easier for us. Machines do this by: • reducing the force we use (offering a force advantage) MA > 1 • doing the job faster (offering a speed advantage) MA < 1

  3. MechanicalAdvantage • The relationshipbetween the force produced by a machine (the load force) and the force applied to the machine (effort force) in order to lift or move an object.

  4. CalculatingMechanicalAdvantage MA= Load Force (LF) Effort Force (EF)

  5. Example • You exert 500 N of force on a branch to try to lift a truck out of the mud. The truck exerts a force of 2500 N. Calculate the mechanicaladvantage of the lever.

  6. Examples • 400 N 10 N 2 kg 80 N

  7. CalculatingMechanicalAdvantage • MA =

  8. Examples • 50 cm 200 cm 95 cm 150cm

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