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28 May, 08:47

A hockey puck with a mass of 0.35 kg slides across the ice after a slap shot toward the goal. If the puck decelerates at 7.8 m/s/s, what is the coefficient of Friction between the ice and the puck?

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  1. 28 May, 09:08
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    The sliding friction is the net force acting on puck in horizontal direction,

    Therefore, from Newton's 2nd law of motion,

    f = ma

    f = sliding frictional force = μmg

    μ = coefficient of sliding friction, m = mass of puck, a = deceleration = 7.8 m/s²

    ∴ μmg = ma

    ∴ μ = a/g = 7.8/9.8 = 0.795

    Therefore, the coefficient of friction is 0.795
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