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Physics
Classical Physics
Mechanics
Why do objects always rotate about their centre of mass?
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[QUOTE="Leo Liu, post: 6358161, member: 660839"] Clockwise I guess since the force ##\vec F## will induce a static friction force with an opposite direction, which holds the bottom of the still. Therefore, the force F will create a toque which causes the roller to rotate about the point at the bottom. Thus, the roller rolls clockwise.Well, mathematically: (Assuming that the radius of the small circle is r and the radius of the large circle is R) $$\vec \alpha I_{bottom}=\vec \tau$$ $$\vec \alpha (I_{centre}+m_{roller}R^2)= (\vec r-\vec R) \times \vec F $$ $$\therefore \alpha \: is \: pointing \: out \: of \: the \: screen.$$ $$\therefore rolls \: clockwise$$ [/QUOTE]
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Forums
Physics
Classical Physics
Mechanics
Why do objects always rotate about their centre of mass?
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