Physics
Grade-10
Easy
Question
Seat belts are used to prevent injuries in case of fast-moving car as seat belts increase the time duration thus decreasing the effect.
Which law is being followed here?
- Newton’s first law of motion
- Newton’s second law of motion
- Newton’s third law of motion
- More than 2 law of motion
Hint:
If an object A exerts a force on object B, then object B must exert a force of equal magnitude and opposite direction back on object A.
The correct answer is: Newton’s second law of motion
More than 2 law of motion
Law of inertia, also called Newton's first law, postulate in physics that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.
When the car crashes, there is no unbalanced force acting on the person, so they continue forward (Newton's First Law). The person moves against the seat belt, exerting a force on it. The seat belt then exerts a force back on the person (Newton's Third Law).
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