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  • A simple machine is a device that makes work easier, faster and more convenient.
  • Terms used in simple machines are:
    • Effort: force applied to the machine.
    • Load: body on which work is done.
    • Fulcrum: fixed point about which the machine can turn.
    • Input energy: energy supplied to the machine.
    • Output energy: useful work done by a machine.
    • Principle of machine: for an ideal machine the output is equal to its input.
    • Velocity ratio=VEVL=dEtdLt=dEdL
    • Relation between mechanical advantage and velocity ratio

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