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Using Machines

Delve into the world of simple machines to learn why they make work easier. Explore concepts like input force, mechanical advantage, and energy conservation. Discover how to increase efficiency and optimize work output.

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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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