Belt up your life:
Wearing a seat belt resists the motion of our body to go along the direction of motion of the car during
accidents.
An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
This law is often called “the law of inertia”. This means that there is a natural tendency of objects to keep on doing what they're doing.
All objects resist changes in their state of motion. In the absence of an unbalanced force, an object in motion will maintain this state of motion. Thus there are two parts to the statement of Newton's first law of motion – one which predicts the behavior of stationary objects and the other which predicts the behavior of moving objects.
The first law of motion effectively defines force. Force is a physical quantity that changes, or tends to change, the state of motion of a body.
Inertia can be of two types. They are inertia of rest and inertia of motion. Inertia of rest is the backward motion a passenger in a stationary train feels when the adjacent train starts moving forward. Inertia of motion is the cause of lunging forward action experienced by passengers when a moving car stops abruptly.