Newton's First Law of Motion, also known as the Law of Inertia, states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. It describes what would happen in a car crash if the driver is not wearing a seatbelt, with the driver continuing to move at the speed of the car and hitting the interior rather than being held by the seatbelt.

1. Newton’s First Law of Motion

4. Newton’s First Law of Motion