Recent content by guthix

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    Solve rolling problem using concept of angular momentum

    got it~thanks again :)
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    Solve rolling problem using concept of angular momentum

    wow, thanks very much (i think) I've understand the problem just one more minor question for similar reason, is the total angular momentum of the Earth = angular momentum of Earth's CM about the Sun + angular momentum about the Earth's CM ?
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    Solve rolling problem using concept of angular momentum

    um...then my method of using M(vo)R = MvR + Iw should be interpreted as "take moment about the initial contact point", right?
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    Solve rolling problem using concept of angular momentum

    you mean...i can take moment about, say, the initial contact point? i just think it is difficult to understand, even the line of action of friction passes through it, i can't treat it as no external torque because the point is no longer related to the rotational motion of the ball... and...
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    Solve rolling problem using concept of angular momentum

    i told him if i take moment at the contact point then there is no external torque, and he ask me whether "that point" is moving or not, i don't know why he ask for this, i have never think about this so i didn't answer. other classmates challenged me that "as the ball is rolling, the point does...
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    Solve rolling problem using concept of angular momentum

    Homework Statement A ball of mass M and radius R initially slides with speed vo but without rotating on a horizontal surface with friction. Without knowing anything about the nature of the frictional force, find the speed of the ball when it begins to roll without slipping. Homework Equations...
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