Due to inertia, passengers on a bus often slide backward when it suddenly starts to move.
The ability of matter to resist changes in velocity (speed and/or direction) is known as inertia. The first law of motion states that unless an outside force acts on an item, it will continue to move at a certain speed.
A feature of matter known as inertia is the ability to maintain either a state of rest or uniform motion in a straight line without the assistance of an external force. A body's inertia is a quality that prevents it from changing its state of motion or rest.
A body at rest or travelling in a straight line at a constant speed will continue to do so unless it is acted upon by a force, according to the law of inertia, often known as Newton's first law, a physics postulate.
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