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5 April, 21:56

Anouk does 150 J of work using a hammer to pull a nail out of a piece of wood, and the hammer does 105 J of work on the nail. What is the efficiency of the hammer?

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  1. 6 April, 01:42
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    The efficiency of any machine is given by:

    efficiency = output obtained / input given

    Substituting the values,

    Efficiency = 105 / 150

    Efficiency = 0.7

    Converting this to a percentage, the efficiency of the hammer is 70%.

    This is a fairly high efficiency, and this is due to the fact that the hammer is a simpler machine. The more complex a machine is, the greater are the losses in it due to friction, meaning there is a lower efficiency.
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