Rotation of a non pivot object

  • Thread starter VHAHAHA
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  • #1
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Main Question or Discussion Point

my teacher told.me.that If a rotating uniform stick is falling, the axis of rotation is about the cm of the stick.
I dont understand why it is about the cm of the ball. I have searched on google and i found no answer.
Can anyone give me some reference so that I can read? Can anyone explain to me? Thank you
 

Answers and Replies

  • #3
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i have read this note
but i still cant the answer
any tips?
 
  • #4
D H
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You can describe the motion of a rigid body as a combination of translation of some point fixed with respect to the rigid body and rotation about that point. That point? It's completely arbitrary. It doesn't even have to be a point on the object. It's a consequence of Euler's rotation theorem.

So why choose the center of mass? That is the one point for which translational and rotational motion decouple from one another.
 

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