M1 question.

Hi, I have this hard Newtons third law question..

A smooth bead B of mass 0.6kg is threaded on a light inextensible string whose ends are attached to two identical rings, each of mass 0.4kg. The rings can move on a fixed straight horizontal wire. The system rests in equilibrium with each section of the string making an angle 'theta' with the vertical.

(a) Find the magnitude of the normal contact force exerted on each ring by the wire.

(b) Find in terms of 'theta', the magnitude of the frictional force on each ring.

Thanks a lot
From John

Question.JPG5.1KB

Reply 1

warnett

its been a long time since ive done mechanics, so i can only remember how to do part A:

let the rings be A and B and the contact forces be R and S respectively
When the system is at rest, then R = S
resolving vertically gives: R + S = 0.6g
so R = S = 0.3g

hope this helps

j

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