A 110 g hockey puck sent sliding over ice is stopped in 14.9 m by the frictional force on it from the ice. (a) If its initial speed is 7.8 m/s, what is the magnitude of the frictional force? (b) What is the coefficient of friction between the puck and the ice?

Answer 1

(a) Friction force * distance = (initial kinetic energy)
Solve for the friction force.
(b) Divide friction force by puck weight to get the coefficient of (kinetic) friction.