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标题: one physics problem [打印本页]

作者: QFT 时间: 2005-9-20 06:48
标题: one physics problem

Pure physics problems seldom appear here.

But I give one anyway.

a sphere with radius R is on a slope with angle A
suppose there is no friction.
Find the motion of the ball.
Say sliding with rotatng, pure sliding or pure rotating. Might depend on the angle A.
Further, give the velocity of CM (center of mass) and angular velocity (if rotating)

作者: 寒潭清 时间: 2005-9-20 08:53
标题: 脑筋一动里的题应该是多样化的.欢迎出题!谢谢[@};-][@};-][:)]

脑筋一动里的题应该是多样化的.欢迎出题!谢谢

作者: ob 时间: 2005-9-20 23:47
标题: 回复：one physics problem

Without friction, then I guess the ball will not rotate. The movement is slide only. I may wrong.

The Cm speed is V=t*g*sinA. t is the sliding time.

作者: QFT 时间: 2005-9-21 00:28
标题: 回复：回复：one physics problem

Thanks for trying this problem.

As to rotation, we need consider torque, which is r cross F (force).

作者: ob 时间: 2005-9-23 09:09
标题: 回复：回复：回复：one physics problem

I got your point. Need to go back to Physics to fresh my memory

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