Physics
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.
Laws of Motion
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Answer
(iii)
Reason — When a man applies a force F (action) backward by his foot on the ground against the force of friction, the ground exerts an equal and opposite force R (reaction) forward on his foot. The horizontal component of the force of reaction enables the man to move forward.
Obviously, it will be difficult to move on a slippery road where friction is less.
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A footballer hits a football with a force of 10 N. What force does the footballer experience ?
- 5 N
- 10 N
- 20 N
- 15 N
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.
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.
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.