What is Inertia?
Inertia is the first law of motion. It is when an object wants to continue what it is already doing. But if an obstacle is put in its way it will resist stopping. An example is a car, if the car suddenly stops moving(brake) the people in the car still want to move but a seat belt will act as an obstacle by stopping you from moving. Also when a stone is kicked it take force to kick it because it doesn't want to stop want its doing, but if it faces an obstacle such as air friction, rough ground or a physical obstacle then it will resist stopping, but eventually stop.
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