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Puck collision with rod using angular momentum conservation
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[QUOTE="ChiralSuperfields, post: 6851613, member: 731016"] Thank you for your reply [USER=192687]@kuruman[/USER] ! I don't think angular momentum is conserved before the collision because there is a torque due to gravity acting on the putty. I think the statement in the solution must be referring to during and after the collision. I think during the collision the impact force from the putty on the puck will be equal to the normal force from the puck onto the putty. I think this is possible if the surface that the puck is on has infinite inertia, so will not accelerate during the collision but will exert a infinite force to slow the puck instantaneously. Since the net force is in the z-direction, then there must be a torque due to the normal force about the z-axis though plane of rotation. However, since this torque is perpendicular to the plane of rotation (and angular momentum of the puck), then it cannot change the puck's angular velocity and therefore angular momentum of the puck. However, I now realize that during the collision, the putty will lose some of its angular momentum about the AoR. Does that mean that angular momentum is not conserved during the collision? Maybe it's only a component of the angular momentum of the system putty + puck system that is conserved during before, during, and after the collision. Many thanks! [/QUOTE]
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Puck collision with rod using angular momentum conservation
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