A hockey puck of inertia 0.25kg travels at 10m/s to the right and collides with
ID: 1317888 • Letter: A
Question
A hockey puck of inertia 0.25kg travels at 10m/s to the right and collides with a lump of Silly Putty (inertia 0.1kg) at rest. The combined lump of puck and putty moves at 3.5m/s to the right.
(a) What is the energy dissipated in the collision?
(b) If the system is defined as the puck and the Silly Putty, was this system isolated? Prove your answer quantitatively.
(c) What would be the total convertible energy in this collision, assuming it was isolated? (Do you want to change your answer to (b)?)
Explanation / Answer
(1):
energy dessipated in collision = energy before collision - energgy after collision
energy before collision = KE of hockey puck + KE of silly putty = (1/2)*0.25*10^2 + 0 = 12.5 Jules
energy after collision = KE of (hocky puck + silly putty) = (1/2)*0.35*3.5^2 = 2.1437 Jules
energy dessipated in collision = 12.5 - 2.1437 = 10.3563 Jules
(2):
no the system is not isolated because for an isolated system there is no loss in energy but in this system there is some energy loss.
(c):
total convertible energy in the system is initial KE of the system that is KE of puck
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