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In the winter sport of curling, players give a 20 kg stone a push across a sheet of ice. A curler accelerates a stone to a speed of 3.0 m/s over a time of 2 s.
a)How much force does the curler exert on the stone?
b)What average power does the curler use to bring the stone up to speed?

  • Physics - ,

    The acceleration rate while pushing is 3.0/2 = 1.5 m/s^2

    The force required to accelerate the stone at that rate is F = M*a = 30 N.

    This assumes zero ice friction resistance. That is a fairly good assumption, since they travel so far.

    Average power = (kinetic energy added)/(2 seconds)
    = (M/2)Vfinal^2/Time = 45 watts

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