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Simple Machines – Wheel and Axle, Wedge and Screw

Simple Machines – Wheel and Axle, Wedge and Screw. Wheel and Axle. A wheel and axle is a combination of 2 wheels of different diameter that turn together. The largest wheel is the wheel The smallest wheel is the axle. Load arm. Effort Arm. Examples of this type of wheel and axle:

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Simple Machines – Wheel and Axle, Wedge and Screw

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  1. Simple Machines – Wheel and Axle, Wedge and Screw

  2. Wheel and Axle • A wheel and axle is a combination of 2 wheels of different diameter that turn together. • The largest wheel is the wheel • The smallest wheel is the axle

  3. Load arm Effort Arm • Examples of this type of wheel and axle: • 1. Motor • 2. Ski lift • 3. Bike • Because the LOAD ARM is longer than the EFFORT ARM we get a speed/distance advantage! Effort Force Load

  4. Effort arm Load Arm • Examples of this type of wheel and axle are: • 1. Steering Wheel • 2. Door Knob • Because the EFFORT ARM is longer than the LOAD ARM, we get a mechanical advantage. Effort Force Load

  5. Screw • A screw is an inclined plane wrapped around a cylinder • A screw gives you a mechanical advantage. • The closer the threads, the more of a force advantage you get. • A screw can be used to convert turning motion into linear (straight) motion. • EXAMPLE: Archimedes screw

  6. Wedge • A wedge is a two sided inclined plane that goes into an object. • By pressing on the wide end of the wedge, you can exert a force on the narrow end so it splits an object apart. • Examples: • 1. Knife blade • 2. Axe • 3. Door stop 2 Inclined Planes Load Load Effort Force

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