Newton's First Law


A body at rest remains at rest and a body in motion remains in uniform motion,
in a straight line motion, unless acted on or compelled to change by an external unbalanced force.

It known that forces are necessary to cause anything to move if it is originally at rest.

Newton called inertia, the property of a particle that allows it to maintain a constant
state of motion or rest inertia. Newton’s First Law is sometimes called “the Law of
Inertia”. All objects have inertia.

So bjects in nature tend to: