A 0.5 kg hockey puck collides with a wall. The figures below show the velocity o

Question

A 0.5 kg hockey puck collides with a wall. The figures below show the velocity of the puck (left; green), and the force exerted by the wall on the puck (right; red). How long is the puck in contact with the wall? SHOW YOUR WORK and EXPLAIN YOUR REASONING. A 0.5 kg hockey puck slides to the right at 10 m/s. It is hit with a hockey stick that exerts the force shown in the red curve below (approximately a Gaussian). What is its approximate final speed? CAREFULLY DRAW ON THE GRAPH BELOW HOW YOU ARE APRROXIMATING THE AREA. There is no "one correct way" to do this approximation - they could range from fairly crude to fairly sophisticated - so explain to me how you are performing this approximation.

Explanation / Answer

i) suppose the wall applies a force of 36N on the hocky puck.

impulse = m delta V

36t = 0.5*6

t = 0.5/6 = 0.0833 s

ii) Lets assume that it remains in contact with the ball for 20 ms or 0.02 s.

final speed v =[0.5*10 -36*0.5*0.02]/0.5

                 = 4.64/0.5 = 9.28 m/s   Answer

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