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From a little bit of thinking, this is what I concluded:
A system initially at rest can change its angular position without any outside torques (the final state will also be at rest).
A system initially at rest cannot change its displacement without an outside force.
In other words, cons. of linear momentum also implies that a system cannot move its CM without outside forces, however, cons. of angular momentum does not prohibit a body from changing its angular orientation without outside torques, due to the fact that rotational inertia can be changed internally.
Is this correct, or can anyone offer counterexamples?
A system initially at rest can change its angular position without any outside torques (the final state will also be at rest).
A system initially at rest cannot change its displacement without an outside force.
In other words, cons. of linear momentum also implies that a system cannot move its CM without outside forces, however, cons. of angular momentum does not prohibit a body from changing its angular orientation without outside torques, due to the fact that rotational inertia can be changed internally.
Is this correct, or can anyone offer counterexamples?