24and when no torque acts on a system ,u cna conserve angular momentum
I am facing problem as to when and where to conserve Linear momentum of a system and where to conserve the angular momentum of a system.
can the linear momentum be conserved when angular momentum is already conserved?
-
UP 0 DOWN 0 0 7
7 Answers
241Well think it intuitively, see when we say a body is rolling purley on a surface we say that for that body vcm=rω this is because:
imagine a sphere rolling now think abt the surface in contact if the velocity of that point with respect to the ground is zero then we can say no friction is acting(because at that point forward vlocity is rω and the backward velocity is vcm henc net = vcm+rω=0 ) hence the rolling is pure(no force is acting).
now if rω≠vcm then friction acts and will make it to roll purely..
1For bodies such as rod or ring the force of gravity cannot be considered to be acting through the c.m. What to do in such a case??
3mmm not always subhomoy.it depends on mass distribution and also on gravitational force.