It is easier to push an empty box than a box full of books because the empty box has less mass and therefore less inertia, making it easier to change its state of motion.

The application of an unbalanced force by the engine to change the direction of motion of the motorcar causes our body to resist the change, leading to us slipping to one side of the seat due to inertia.

This behavior is explained by Newton’s first law of motion, which states that an object at rest will remain at rest unless acted upon by an unbalanced force.

During a sharp turn, the inertia of our body causes us to resist the change in direction applied by the engine, resulting in us slipping to one side of the seat.

We tend to get thrown to one side due to our body’s inertia, which causes us to continue in our straight-line motion while the car changes direction.