Actually the law of inertia states that the Natural Tendancy of the Body to resist Change unless acted upon by an external Force (Gravity, Surface Friction and Air Resistance) Eg: A car Hitting a  certain Wall 
Thankyou! 2 more examples pls. :)
Inertia was best explained by Sir Isaac Newton in his first law of motion. Basically, the law of motion is that an object at rest stays at rest and an object continues in motion until an external force acts on it.
Tightening of seat belts in a car when it stops quickly.
If you are on a train and the train is moving at a constant speed, a toy tossed into the air will go straight up and then come down. This is because the toy has inertia like the train and you.
2 more examples pls. :) thankyou very much!
It is harder to stop a big vehicle, like a bus, than a smaller vehicle, like a motorcycle. There is more inertia with the bigger object.
When entering a building through a rotating door, inertia will allow the door to hit you in the back if you don’t get out of the way.