Rotation 2
We can only write v = rω when we take moment of inertia about the axis which is at rest at an instant, for pure rolling round bodies, we should only be able to write it if we take acis about it's point of contact with the rough surface where it's pure rolling...
In this question, why is the moment of inertia taken about the axis through the com and still v = rω is used?
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@Gyro Gearloose
Note for OP
+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.What I'm saying is, anything that rolls, we take that rolling about an axis through a point...
But for v=rw to be valid, we need to take rolling about the axis through the point about which pure rolling is happening right?
We can't just take any axis and say it's pure rolling
Just like, during rolling, we use v=rw when we consider axis is through the ICR
Ball is pure rolling about COM and the center of mass have some velocity. the axis you are talking about is Instataneous axis of rotation which you can only apply when ball is pure rolling, but the point dosent have any velocity in that instant so if you write 1/2Iw^2 about IAR its your total kinetic energy.
Youre confusing that with pure rolling the one only condition for pure rolling is bottom post point or point which is in contact with ground have no velocity
+solved
+solved @SIMPle Potato
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