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A wheel and axle are two simple machines working together. The basic uses of a wheel and axle are to:

  • alleviate friction on a sliding body
  • increase the amount of force applied to a rotating body
  • decrease the amount of mechanical energy needed to oppose gravity
The fixed axle on wheelCan be used to make work easier when a larger diameter cylinder attached to a smaller diameter cylinder acts like a cylindrical fulcrum. The larger diameter cylinder takes less energy to turn the smaller diameter cylinder that acts against the load.

Think of a doorknob, or a rotating valve on a faucet.

Used with the opposite effect this can also increase the speed of a rotating object by requiring more force.

Think of a toy top, or a vehicle drive line.

The free wheel on axleCan be used to make work easier by lessening the friction between an object and what it is intended to slide against.

Think of a car, wagon, or skateboard.

The wheel and axle on a fulcrumUses three simple machines to lessen the mechanical energy needed to oppose the force of gravity while also lessening friction.

Think of a wheelbarrow, a wheeled air travel bag, a donkey cart, or vehicle trailer.

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