- #1
theRIAA
- 18
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This was a conceptual question on my physics exam:
True or false: You drop a non-rotating disk onto a rotating disk. When they hit they slide against each other with friction for a few seconds before they both start rotating at the same rate together. Because of losses due to that friction, angular momentum will NOT be conserved. (No other information was given)
I put True, the "correct" answer was False.
Am I wrong? Won't energy be lost as heat and sound through friction?
True or false: You drop a non-rotating disk onto a rotating disk. When they hit they slide against each other with friction for a few seconds before they both start rotating at the same rate together. Because of losses due to that friction, angular momentum will NOT be conserved. (No other information was given)
I put True, the "correct" answer was False.
Am I wrong? Won't energy be lost as heat and sound through friction?