Forces in action _______________________________________________________________________________________________________________________________________________________________________________________________________________________
10. Inertia
INERTIA: It is the reluctance to change the velocity.
It is a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force.
The inertia depends on its mass: a bigger mass needs a bigger force to overcome its inertia and change its motion.
If you’re driving at 65 km/h and have an accident, the car may come to a stop in an instant, while your body is still moving at 65 km/h. Without a seatbelt, your inertia could carry you through the windshield.
This video will help you better understand inertia, motion and friction.