A body continues to be in its state of rest or in uniform motion in a straight line unless an external unbalanced force is applied on it.
Newton's first law in practical scenarios
Some applications of Newton's first law in real life scenarios are: 1. A suitcase kept in the train remains in rest w.r.t the train unless brakes are applied or train gains speed. 2. Passengers in the bus fall forward when brakes are applied.