Question

Which of Newton's Laws of Motion is best illustrated by the use of seatbelts in a car crash?

A) Law 1: An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
B) Law 2: The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
C) Law 3: For every action, there is an equal and opposite reaction.
D) Law 4: The force of gravity acts between all objects in the universe.

Answer 1

The use of seatbelts in a car crash illustrates Newton's First Law of Motion, which explains how the seatbelt provides the unbalanced force needed to change the passengers' motion.

Step-by-step explanation:

The use of seatbelts in a car crash is best illustrated by Newton's First Law of Motion: An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. This law, also known as the law of inertia, explains why passengers experience a sudden forward movement when a moving car stops abruptly. The seatbelt applies a force to hold the passengers back, providing the unbalanced force necessary to change the passengers' state of motion and prevent them from continuing to move forward.