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Conservation of angular momentum of pucks

  • Thread starter dman_PL
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  • #1
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Homework Statement



Two identical pucks, each of inertia m, are connected to a rod of
length 2r and negligible inertia that is free to rotate about its center. A third puck of inertia m strikes one of the connected pucks perpendicular to the rod with a speed vi

Write the expression for conservation of angular momentum in terms of m, vi, the
final velocity of the puck, vf , and ω, the angular speed of the connected pucks. No I’s should be left. You do not need to solve these for vf and ω


Homework Equations


Well angular momentum is L=Iω
I=(1/2)MR^2



The Attempt at a Solution


I have L=((1/2)MR^2)(ω)

However I dont see where the Velocities should go
 

Answers and Replies

  • #2
Andrew Mason
Science Advisor
Homework Helper
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Homework Statement



Two identical pucks, each of inertia m, are connected to a rod of
length 2r and negligible inertia that is free to rotate about its center. A third puck of inertia m strikes one of the connected pucks perpendicular to the rod with a speed vi
I am not clear about the question. Is there a fixed pivot at the centre of the rod?

AM
 

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