SIMPLE%20MACHINES

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SIMPLE MACHINES
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Machines do the following

• Transform energy from one form to another
• Multiply force (pulleys can loft more with less
  force)
• Multiply speed (bike wheels move faster with
  gears swinging a bat)
• Change direction of a force (flag pole-pull down
  to raise a flag)

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Six Simple Machines

• Inclined Plane
• Wedge
• Screw
• Lever
• Wheel and Axle
• Pulley

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Inclined Plane

• Inclined planes DO NOT move
• No less work but does allow for less effort

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Wedge

• 2 inclined planes back to back
• Increases force

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Screw

• Inclined Plane wrapped around a cylinder
• 2 parts body (cylinder) and thread

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Parts of a Lever Page 166

• Fulcrum
• Input Force (IF) or Effort Force (EF)
• Output Force (OF) or Load Resistance (LR)

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Types of Levers pg 166 and 168
1st Class Lever-fulcrum is between the IF/EF and
OF/LR (pliers) 2nd Class Lever-OF/LR is between
the fulcrum and IF/EF (wheel barrow) 3rd Class
Lever- IF/EF is between the fulcrum and
OF/LR (arm)
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Wheel and Axle

• Wheel connected to a pole
• Modified lever center axle is a fulcrum, wheel
  is a lever rotating in a circle

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Pulley

• Grooved wheel that turns around an axle
• Changes the direction of force

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FAMILIES

• Lever Family
• Levers 1st, 2nd 3rd Class
• Wheel and Axle
• Pulley
• Inclined Plane Family
• Inclined Plane
• Wedge
• Screw