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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