State Newton's first law of motion.Give two examples to illustrate Newton's first law of motion.

Newton's first law of motion is based on inertia, which is defined as an object's reluctance to change its state of motion. It states that unless driven by an external force to change its condition of rest or uniform motion, a body at rest will remain at rest and a body in motion will continue in a straight line with a uniform speed.

When a ball rolls on a frictionless surface, for example, it continues to roll until it is stopped by an external force or friction.

When we place a key on the table, for example, it stays there until we carry it to another location or apply force to it.

Hence, Newton's first law of motion can be illustrated with examples such as unless we lift a book from the table with our hands, it remains on the table and a moving car on a frictionless surface will continue to move unless friction is given to it.