›› 2011, Vol. 30 ›› Issue (2): 5-5.
• 著者文摘 • Previous Articles Next Articles
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Abstract: A misunderstanding for a cord being lifted up or falling down is analyzed, there is a point of sudden change of velocity in it. A way to solve the problem is proposed and which is examined by experiment.
Key words: soft-cord problem, momentum theorem, energy theorem, trap
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