- #1
cupid.callin
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Homework Statement
The Attempt at a Solution
The book did it like taking impulse of forces f and writing eqn Impulse = Δ(Angular momentum)
or J = ΔL
How i tried:
let the 2 cylinders meet at A
(they have not mentioned the velocity of approach but as it says that the 2 cylinders remain in contact and don't fly off after collision so i guessed that velocity is negligible)
Considering Torque at A
As no torque acts during whole process so L about A remains constant
[tex]L_{initial} = I_1w_1 \ - \ I_2w_2[/tex]
now let that after they meet and friction does it work they have angular speeds w1' and w2'
[tex]L_{final} = I_1w_1' - I_2w_2'[/tex]
and also
[tex]w_1'r_1 = w_2'r_2[/tex]
as the point of contact of 2 cylinders has same velocity
But this gives wrong answer!
Can someone tell me why this method is wrong?