Edit - Consider an homogeneous bar of length L and mass M. This bar can rotate on a horizontal plane with no friction around a point A. The distance between A and the center O of the bar is a. Since we are on a plane, the gravity is not working.
Suppose that this bar is rotating with constant angular velocity ω0.
Moreover, suppose that this bar hits a mass m in a point B. The distance between B and the center O is b. Regardless the nature of the collision (elastic or inelastic), I was told that linear momentum is not conserved while angular momentum is.
The explanation I received is the following: during the collisions, an impulsive force arises on the fulcrum in A; this force is external and hence the linear momentum is not conserved, while the angular one is conserved since this impulsive force does not produce torque in A.
This explanation does not convince me totally.
I would like to figure out which are the forces that arises during the collisions. Moreover, I would like to know in which points they act.
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