Science

A hockey puck is given an initial speed of
30 m/s on a frozen pond. The puck remains
on the ice and slides 130 m before coming to
rest.
The acceleration of gravity is 9.8 m/s^2 .
What is the coefficient of friction between
the puck and the ice?

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  1. x = (v+u)(v-u)/2a
    where x = distance, v = final speed, u = initial speed, a = acceleration
    substituting known values:
    130 = (30)*(-30)/2a
    a = -900/260 = -3.46 m/s^2

    f = ma
    u(k)*f(normal) = m*a
    u(k)*m*g = m*a
    u(k) = a/g
    u(k) = 3.46/9.8 = 0.35

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  2. blumeor

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