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Mechanics
21 Dec 2007 14:30:35 IST
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28 Dec 2007 11:26:01 IST
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i agree that the velocity of the lower most point is zero . so friction should not act. but if friction does not act then after sometime it will stop pure rolling. think what will cancel out the ext force torque(other than fricton). it is friction. but in case there is no any other external torque then there is no need of friction.
31 Dec 2007 19:52:55 IST
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Ideally speaking, rolling friction will be zero on any perfectly rigid body.
But no body is perfectly rigid. There will be deformation at the point of contact with ground. So, the lines of action of normal force and weight are different. this results in rolling friction.
For detailed discussion, refer to:
http://webphysics.davidson.edu/faculty/dmb/PY430/Friction/rolling.html
But no body is perfectly rigid. There will be deformation at the point of contact with ground. So, the lines of action of normal force and weight are different. this results in rolling friction.
For detailed discussion, refer to:
http://webphysics.davidson.edu/faculty/dmb/PY430/Friction/rolling.html
31 Dec 2007 19:59:18 IST
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nope frictional force is nt dere wen body is in pure rolling motion.
it is only before attaining pure rolling dat dere's friction bcz it helps in acheiving pure rolling state
and aftr attaining
it dere will be no friction even if surface is rough
as velocity of lowest pt of body is 0.
nd it stops aftr sum time bcz of rolling friction wich is diff from simple friction
it is only before attaining pure rolling dat dere's friction bcz it helps in acheiving pure rolling state
and aftr attaining
it dere will be no friction even if surface is rough
as velocity of lowest pt of body is 0.
nd it stops aftr sum time bcz of rolling friction wich is diff from simple friction
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for eg:
A body is rolling with linear velocity v and rotating with angular velocity
case1
if we take friction is acting front.
then it will decrease and increase v
and it will slip
case2
if it acts backwards
then it will increase and decrease v.
and again it will slip
i hope this was useful