# A hockey puck on a frozen pond with an initial speed of 18.50 m/s stops after sliding a distance of 224.1 m. Calculate the average value of the coefficient of kinetic friction between the puck and...

A hockey puck on a frozen pond with an initial speed of 18.50 m/s stops after sliding a distance of 224.1 m. Calculate the average value of the coefficient of kinetic friction between the puck and the ice

justaguide | College Teacher | (Level 2) Distinguished Educator

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A hockey puck on a frozen pond has an initial speed 18.50 m/s, it stops after sliding a distance of 224.1 m. If the coefficient of kinetic friction between the puck and the the ice surface is K, the frictional force acting on it is N*K where N is the normal force equal to M*g, M being the mass of the puck and g the acceleration due to gravity.

The deceleration due to the frictional force is K*g. The puck travels 224.1 m before stopping, use the formula v^2 - u^2 = 2*a*s.

18.5^2 - 0 = 2*K*g*224.1

As the gravitational acceleration is 9.8 m/s^2

18.5^2 = 2*K*9.8*224.1

=> K = 0.0779

The coefficient of kinetic friction between the puck the ice is 0.0779