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Machines

Machines. Mr. Skirbst Physical Science Topic 06. What is a machine?. What is a machine?. - an instrument that makes work easier. What is a machine?. an instrument that makes work easier WORK WORK INPUT → MACHINE → OUTPUT. What is efficiency?. What is efficiency?.

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Machines

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  1. Machines Mr. Skirbst Physical Science Topic 06

  2. What is a machine?

  3. What is a machine? - an instrument that makes work easier

  4. What is a machine? • an instrument that makes work easier WORK WORK INPUT → MACHINE → OUTPUT

  5. What is efficiency?

  6. What is efficiency? • A comparison of work output to work input

  7. What is efficiency? • A comparison of work output to work input E = ( Wo ) / ( Wi )

  8. What is efficiency? • A comparison of work output to work input E = ( Wo ) / ( Wi ) • “E” NEVER reaches 100% • Some “E” always lost (friction)

  9. What is a mechanical advantage?

  10. What is a mechanical advantage? - How much a machine multiplies the “effort force”

  11. What is a mechanical advantage? • How much a machine multiplies the “effort force” M.A. = ( Fr ) / ( Fe ) Fr – resistant force Fe – effort force

  12. What is a mechanical advantage? The higher the MA, the easier it is to do work

  13. What is a mechanical advantage? Illustrations: Lever: Pulley:

  14. What is a simple machine?

  15. What is a simple machine? A basic instrument that can increase the mechanical advantage

  16. What is a simple machine? • Inclined Plane - a flat, slanted surface - ex. Ramp, door lock

  17. What is a simple machine? • Wedge - inclined plane that moves - ex. knife, ax, key

  18. What is a simple machine? • Screw - inclined plane around a cylinder - ex. screw, bolt, jar lid

  19. What is a simple machine? 4. Lever - rigid bar free to pivot around a fulcrum - ex. crowbar, paddle, pliers

  20. What is a simple machine? • Wheel and Axle - circular object turning around an axle (larger cylinder around smaller cylinder) - ex. Wheel, windmill, door knob

  21. What is a simple machine? • Pulley - rope or chain around a grooved wheel and axle - ex. window shade, flag pole, block and tackle

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