Newton's+Law+of+Inertia

Law of Inertia
An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion will remain in motion unless acted on by an unbalanced force.

This Law explains how objects that are at rest want to remain at rest, this law also explains that the more mass objects have the harder it is to move them because its mass is helped by gravity which makes the object harder to move but if you use lighter objects they will be easier to move because they have less mass so its not pushing itself down as much and gravity doesn't help it as much as it would help another object to stay in place, but this law also explains how an object in motion doesn't want to be stopped by an unbalanced force. When object is in motion it is stopped by 2 forces:
 * Friction
 * Unbalanced force (wind, rock ect.)

A scientist named Nicolaus Copernicus did disagree on a statement based on inertia. What he said (Nicolaus Copernicus) was that the earth was never at rest but it was in motion all the time (orbiting the sun). Later Galileo came to a conclusion that it is impossible to tell the difference between an object at rest and an object in motion without an outside force to compare it with. Galileo's observation became the basis of Einstein' s theory of Special Relativity (E=mc2).