F=mg is a good approximation if the initial rod position

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送交者: gyro 于 2009-09-16, 17:24:25:

回答: 昨天的关于铁棍帖子我没看；假定F=mg可以接受， 由 coubert 于 2009-09-16, 16:29:31:

is almost vertical.

It is a poor approximation if the initial rod position is almost horizontal. Then the force from the ice is much smaller than m*g.



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