The friction force Ff = 60 lb equals the pulling force, since it is not accelerating.
The coefficient of kinetic friction is
(pulling force)/(weight) = 60lb/750lb
= 0.080 (a dimensionless number)
A dog sled weighing 750 lb is pulled over level snow at a uniform speed by a dog team exerting a force of 60 lb. Find the coefficient of friction.
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