Posted by **Lindsey** on Tuesday, November 22, 2011 at 11:54pm.

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 -
**drwls**, Wednesday, November 23, 2011 at 12:09am
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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