Newton's 1st law of motion
Definition
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.
Cars
When the Chevelle is in park it is at rest.
Ceiling fans
This ceiling fan can stay in motion, unless it is turned off.
Comets
Comets are constantly in motion and cannot be stop unless compelled by an external force. (crash)