A hockey puck slides frictionlessly across level ice toward a rigid

PHYSICS · Multi-part · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

0.170\,\text{kg}

hockey puck slides frictionlessly across level ice toward a rigid, vertical rink wall. Immediately before striking the wall, the puck’s velocity is

20\,\text{m}\,\text{s}^{-1}

directed

30^{\circ}

above the positive

x

–axis ("to the right and slightly upward"). During the

0.015\,\text{s}

interval in which the puck is in contact with the wall, it rebounds such that its speed is

16\,\text{m}\,\text{s}^{-1}

directed

40^{\circ}

above the negative

x

–axis ("to the left and upward"). Neglect any vertical forces other than the brief interaction with the wall and assume the puck’s mass remains constant. (a) Resolve the puck’s initial momentum into

x

– and

y

–components. (b) Resolve the puck’s final momentum into

x

– and

y

–components. (c) Determine the impulse delivered to the puck by the wall, expressing your answer with component form, magnitude, and directional angle measured from the negative

x

–axis toward the positive

y

–axis. (d) Calculate the average force exerted on the puck by the wall during the collision.

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