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March 26, 2017

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A mass of 60kg is on the edge of a plank. The Plank is 25 m long. There is a wedge 10 m from the 60 kg. Where would you position a 40kg so the plank would not rotate? If you placed the 40 kg at the end, where would you put a 10 kg mass to keep it balanced?

  • Physics - ,

    The moments of the gravitational forces should balance each other to prevent plank's rotation(about the wedge).
    a)Taking moments about the wedge position:
    40g*X = 60g*10
    X = 15m from the wedge

    b) You can't balance with a 10Kg mass.
    40g*10 = 10g*X
    X= 40m - beyond the length of the plank!

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