Question

“seat belts save lives” is not just a safety catch phrase but the law to wear seat belts in a moving car. why would newton say that we wear seat belts? a an object in motion tends to stay in motion unless acting upon by an external force. b the idiom that every action has an equal and opposite reaction applies to this case. c the acceleration and mass of the object are directly proportional to the force applied. d driver mass and inertia accelerate with the stopping force due to the unbalanced forces.

Explanation:

Newton's first law of motion states that an object in motion tends to stay in motion unless acted upon by an external force. In a car, if there is a sudden stop, without a seat - belt, passengers would continue moving forward due to inertia. A seat - belt provides the external force to stop the passenger's forward motion.

Answer:

A. An object in motion tends to stay in motion unless acting upon by an external force.