Question

body was moving forv when you felt this happening you experienced newtons first law of motion. newtons first law of motion says that an object in motion will stay in motion and an object at rest will stay at rest unless acted on by an unbalanced force. in the car your body was in motion, traveling at the same speed as the car. when the car stopped, your body stayed in motion. if you were not wearing a seatbelt and you were traveling very fast, your body could continue to move forward through the windshield! this idea is called inertia. explain why your body feels like it is being pushed back when the car starts back up again:

Explanation:

When the car starts moving forward, your body, initially at rest (due to inertia as per Newton's first law), resists the change in motion. The car seat exerts a force on your body to move it forward. Your body's tendency to stay at rest makes it feel like it is being pushed back against the seat.

Answer:

When the car starts moving forward, your body (initially at rest) resists the change in motion (due to inertia). The car seat applies a force to move your body forward. Your body's tendency to stay at rest creates the feeling of being pushed back against the seat.