Newton's first law of motion
Newton's first law of motion States that every body continue to remain in state of rest or uniform motion unless acted upon by unbalanced force . This law is also known as law of inertia. Inertia :It is property by virtue of which body continue to remain in state of rest or uniform motion unless it is acted upon by unbalanced force. For experimental demonstration you can visit Newton's first law of motion/ Inertia Inertia is measured in terms of mass of a body. It's SI unit is kg.