Rotational momentum seems to be no matter. In the rotational motion of a body (imagine a disk), there is a state of speed zero (no rotation). And on both sides of it, there are plus and minus rotations. The two behave symmetrical ly. We can see the two Qualitatively and quantitatively.
But what about linear momentum ? Even in the linear motion of a body, there will be a state of speed zero (no moving). And on both sides of it, there will be plus and minus moations. The two behave symmetrically. However, we cannot see the two.
