Inertia

Definition

Inertia is the natural tendency of an object to resist any change in its state of rest or motion.

Summary:

• An object at rest stays at rest unless acted upon by an external force.
• An object in motion continues moving at the same speed and in the same direction unless acted upon by an external force.
• The greater the mass of an object, the greater its inertia.
• This concept is described in the First Law of Motion by Isaac Newton, also known as the Law of Inertia.