- #1
vijayram
- 26
- 1
Homework Statement
A uniform ring of mass m and radius r is projected horizontally with velocity v on a rough horizontal floor,so that it starts off with a pure sliding motion and it acquires a pure rolling motion after moving a distance d.If the coeffcient of friction between ground and ring is a,the work done by the friction in this process is,
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Homework Equations
w = fd[/B]
The Attempt at a Solution
Since the ring starts with a pure sliding motion,the point of contact should move,since it is moving f =aN,N
=mg
so, f=amg
and it begins to roll,after rolling motion starts,friction won't do any work so w=fd.
so work done by friction is -amgd,but given answer is -0.5mv2
Please tell me where have I gone wrong.