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Using Machines

Using Machines. Section 2. What is a Simple Machine?. A device that makes doing work easier Why???? It allows less force to be used over a longer distance. The amount of work cannot be less, only the amount of force

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Using Machines

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  1. Using Machines Section 2

  2. What is a Simple Machine? • A device that makes doing work easier • Why???? • It allows less force to be used over a longer distance

  3. The amount of work cannot be less, only the amount of force • Because W=Fd, if force becomes less, then distance has to increase to keep work the same

  4. Why Use a Machine • Lower the amount of force • Change direction of force • Change the speed

  5. Advantages of Simple Machines • Input force (Fin)-the force applied to the machine • Output force (Fout) the force applied by the machine to overcome resistance

  6. Work • Work input (Win) is the work put in by the user • Work output (Wout) is the work done on the object

  7. Conserving Energy • You do work on the machine, you transfer energy to the machine • Machine does work on the object, energy transferred to object • Energy can’t be created or destroyed • Energy transfer can’t be greater • Machine can’t create energy • So Win= or > Wout

  8. There can never be more output than input • Only an ideal machine will the works be equal • Work input is usually larger because of friction

  9. Mechanical AdvantageMA • The number of times a machine multiplies the effort force

  10. Ideal Mechanical AdvantageIMA • The mechanical advantage of a perfect machine that wouldn’t include friction

  11. Efficiency • A measure of how much work input to converted to work output • High efficiency means little friction • How could the efficiency be increased?

  12. Actual Mechanical AdvantageAMA • The mechanical advantage including friction • Is AMA > IMA or AMA<IMA? • Why?

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