Physics Help Forum Angular momentum for several particles

 Dec 6th 2008, 07:17 AM #1 Junior Member   Join Date: Dec 2008 Posts: 4 Angular momentum for several particles For a system of just three particles, can any show in detail the argument leading from L=Sum (from a=1 to N) of l_a = Sum ( from a=1 to N) of r_aX P_a to L'=external torque. Can any show some steps or have a link to where this is explained?
 Dec 6th 2008, 07:24 AM #2 Senior Member     Join Date: Apr 2008 Posts: 815 I'd say it's because the angular momentum is a vector so it can be added with other vectors. As simple as that. __________________ Isaac If the problem is too hard just let the Universe solve it.
 Dec 6th 2008, 07:31 AM #3 Junior Member   Join Date: Dec 2008 Posts: 4 I need to show it using the sums though, and actually derive it, and i don't really know where to start and how to approach it.
 Dec 8th 2008, 01:16 PM #4 Member   Join Date: Dec 2008 Posts: 65 For any pair of particles, the interaction forces (action and reaction) will have equal and opposite torques (no matter what is the pivot point). They have the same "arm" as they are along the same line. The only torque left is the external torque.

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