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2 simple machines
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2 simple machines

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Transcript

  • 1. Simple Machines
  • 2.
    • Simple machine- a device that does work with only one movement.
    • -Machines make work easier by changing the force you exert in size, direction or both.
    • -Simple machines try to move something that resists being moved. (Ex: friction or gravity)
  • 3.
    • There are 6 types of simple machines. All are variations of lever or inclined plane.
    • Lever Inclined plane
    • 1. Lever 4. Inclined plane
    • 2. Pulley 5. Screw
    • 3. Wheel and 6. Wedge
    • axle
  • 4.
    • Lever- a bar that is free to pivot or turn about a fixed point.
    • - Fulcrum- fixed point of a lever
    • Effort arm- part of the lever where the effort force is applied
    • Resistance arm- part of the lever where there is resistance
  • 5.
    • There are different types of levers.
    • -1 st class Effort ▲ Resist
    • Ex: seesaw
    • scissors
    • pliers
  • 6.
    • -2 nd class Effort Resist ▲
    • Ex: Stapler
    • Wheelbarrow
    • Nail clippers
  • 7.
    • -3 rd class Resist Effort ▲
    • Ex: Tweezers
    • Swinging a bat
    • Fishing rod
  • 8.
    • 2. Pulley- a grooved wheel with rope running along the groove.
    • There are 3 types of pulleys
    • Fixed- the pulley is stationary
    • Movable- the pulley can move
    • Block and tackle- Fixed and movable put together
  • 9. -Fixed -Movable -Block & Pulley Pulley Tackle Pulley
  • 10.
    • 3. Wheel and axle- 2 wheels of different sizes that rotate together.
    • Always travel in a circle.
    • Effort force is applied to the larger wheel while the smaller wheel (axle) exerts the resistance force.
  • 11.
    • Example of a wheel and axle
  • 12.
    • 4. Inclined plane- a sloping surface used to raise objects .
    • Ex: a ramp. Using a ramp, you cover more distance but exerts less force.
  • 13.
    • Screw- an inclined plane wrapped in a spiral.
  • 14.
    • 6. Wedge- an inclined plane with 1 or 2 sloping sides.
    • -Wedges are moving inclined planes.
    • Ex: Knife or ax blade.