Physics
Why is it necessary to wear seat belts while driving according to Newton's law of motion?
- To increase the inertia of the passenger.
- To balance the action and reaction forces acting between the passenger and car.
- To prevent passengers from being thrown forward due to their inertia when the car stops suddenly.
- To increase the momentum of passengers during a collision by applying an external force.
Motion in One Dimension
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Answer
To prevent passengers from being thrown forward due to their inertia when the car stops suddenly.
Reason — When a car suddenly stops, the car experiences an external force (brakes), but the passengers tend to keep moving forward due to their inertia. If not restrained by a seat belt, the passenger can be thrown forward, possibly leading to injury so seat belts apply an external force to the body, reducing motion safely and keeping the person in place.
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Related Questions
Out of the following statements, which one is correct ?
- the sum of action and reaction on a body is zero.
- action and reaction act on different bodies in opposite direction.
- action and reaction are always in opposite direction on the same body.
- action and reaction act on different bodies in the same direction.
Which of the following are examples of Newton's third law of motion?
(i) While catching a ball, the cricketer withdraws his hands along with the ball.
(ii) Athletes often land on sand after taking a high jump.
(iii) Motion of a man on ground
- (iii)
- (ii)
- (i)
- all of the above.
A student is riding a bicycle on a level road. Apply Newton's third law of motion and identify the force which is equal and opposite to the backward push of the rear wheel on the road.
- The force exerted by him on pedals.
- The resistance of the air and force of friction.
- The forward push of the road on the rear wheel.
- all of the above.
Out of the following, which statement does not relate to Newton's laws of motion?
- If a body A exerts a force on body B, then body B exerts an equal and opposite force on body A.
- The force needed to produce a given acceleration in a body is inversely proportional to the mass of the body.
- The rate of change of momentum of a body is directly proportional to the external force acting on the body and takes place in the direction of the force.
- A body continues in a state of rest or of uniform motion in a straight line unless acted upon by an external force.