A puck moves on a horizontal air table. It is attached to a string that gradually winds itself up around a round peg in the center of the table. This shortens the string, so the puck gradually spirals in towards the center. What happens to the magnitude of the puck's angular momentum?

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The Answer of A puck moves on a horizontal air table. It is attached to a string that gradually winds itself up around a round peg in the center of the table. This shortens the string, so the puck gradually spirals in towards the center. What happens to the magnitude of the puck's angular momentum?

A Puck Moves on a Horizontal Air Table