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2009 Planes

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  • 1.
    • S: Inclined planes, wedges, and screws
    • H: Review Notes
  • 2. Inclined plane, wedge and screw April 22, 2009
  • 3. Objectives
    • Define inclined plane, wedge and screw
    • Calculate their MA
  • 4. Inclined Plane
    • A slope or ramp that goes from a lower to higher level
    • It makes moving objects easier.
  • 5.
    • Spreads work over a large distance.
      • Long & gradual  easier to push object.
      • Short & steep  harder to push object.
    Run Rise
  • 6. Inclined plane M.A. Height = 3 meters Slope = 15 meters MA = 15 m / 3 m = 5 MA = Length of Slope Height of Plane
  • 7.
    • The trade-off is that an object must be moved a longer distance than if it was lifted straight up, but less force is needed.
  • 8.
    • A wagon trail on a steep hill will often traverse back and forth.
    • Modern freeways use winding paths through steep mountain passes.
  • 9.  
  • 10. The Wedge
    • A wedge is an inclined plane on its side.
    • A wedge is used to split, tighten, or secure a hold.
    • If you apply force at one end, the wedge will go between something, in this case an ax splits a piece of wood.
  • 11. Where can we find wedges?
    • Wedges that split:
    • Your teeth
    • Every time you bite into something, you are using a wedge.
    • Wedges that cut:
    • A saw
    • A knife
    • Wedges that tighten:
    • A doorstop to keep the door open.
    • Wedges that hold things together:
    • A nail holds wood to a wall or other wood.
  • 12. Mechanical Advantage:
    • MA = 6 in /2 in = 3
    MA = Length of Slope Thickness of Widest End
  • 13. Screw
    • An inclined plane wrapped around a rod or cylinder
    • Used to lift materials or bind things together
  • 14. Screws
    • The inclined plane allows the screw to move itself when rotated.
  • 15. mechanical advantage
    • MA = C / P
    • without using a screwdriver:
    • P = Pitch of screw
    • C = Circumference of the head
    • using a screwdriver:
    • P = Pitch of screw
    • C = Circumference of the screwdriver handle
  • 16. The pitch is the distance between threads. The closer together the threads, the greater the mechanical advantage.