Why do you fall backwards when a car moves forwards?

When a car accelerates forward, your body tends to remain at rest due to inertia, as described by Newton's first law of motion. This means that as the car moves forward, your body feels like it's being pushed backward relative to the car's motion. Essentially, you are not being pushed back by any force; instead, your body is trying to stay in its original position while the car moves ahead. This creates the sensation of falling backwards.