Final answer:
When a ride starts, your body's natural reaction is to be pushed back into the seat due to Newton's 1st Law of Motion.
Step-by-step explanation:
During the start of a ride, your body's natural reaction is to be pushed back into the seat, which can be explained by Newton's 1st Law of Motion, also known as the law of inertia. According to this law, an object at rest tends to stay at rest, and an object in motion tends to stay in motion with the same speed and in the same direction, unless acted upon by an external force.
Learn more about Newton's 1st Law of Motion