Newton's 1st law of motion
Every body remains at a state of rest or uniform motion unless compelled by some external force to act otherwise.
The skater is at a state of rest, until he pushes forward.
When the Chevelle is in park it is at rest.
This ceiling fan can stay in motion, unless it is turned off.
Comets are constantly in motion and cannot be stop unless compelled by an external force. (crash)