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--- 183_notes:l_conservation [2021/05/11 19:04] – [Angular Momentum is Conserved] stumptyl
+++ 183_notes:l_conservation [2021/05/11 19:05] (current) – [Angular Momentum is Conserved] stumptyl
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 For example, if the rotation occurs due to the torque exerted by some known object, putting that object into the system removes it from the surroundings. Thus that object is no longer considered to exert a torque on the system (a system cannot exert a torque on itself). The object transfers angular momentum to other parts of the system. This is a good method for dealing with the situations.
-For the [[183_notes:angular_motivation|ball-person-stool demonstration]] a good choice of system is the ball, person, and stool. In this case, initially the ball has translational angular momentum about the stool axis (remember you still have to pick an axis to determine the angular momentum). As the ball is caught, some of that translational angular momentum is transferred to the person and stool. You read that this translational angular momentum of the ball becomes rotational angular momentum because the whole system rotates with the same angular speed.
+For the [[183_notes:angular_motivation|ball-person-stool demonstration]] a good choice of system is the ball, person, and stool. In this case, initially the ball has translational angular momentum about the stool axis (remember you still have to pick an axis to determine the angular momentum). //As the ball is caught, some of that translational angular momentum is transferred to the person and stool.// You read that this translational angular momentum of the ball becomes rotational angular momentum because the whole system rotates with the same angular speed.
 If all the objects are in the system, there are no external torques hence, the initial and final angular momentum of the system are the same,