A puck moves across a level, frictionless table toward a disk that is at rest. T

Question

A puck moves across a level, frictionless table toward a disk that is at rest. The puck does not spin. In this problem, take all angular momenta with respect to the point marked by the "X." At the instant shown, is the magnitude of the angular momentum of the disk, |L rightarrow disk|, zero or non-zero? Explain. At the instant shown, is the magnitude of the angular momentum of the puck greater than, less than, or equal to that of the puck-disk system? Explain. Suppose that the disk were removed, as shown at right. Would the magnitude of the angular momentum of the puck be greater than, less than, or equal to that of the puck-disk system in parts a and b? Explain.

Explanation / Answer

a) as the disc is not rotating, its angular momentum is zero. b)the angular momentum of the system is only due to the movement if puck and equal to m*v0*x where x is perpendicular distance of velocity vector from the mark. so angular momentum of puck = angular momentum of system. c)even if the disc is removed, the answer is same as that of part b

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