Question

Assertion : When we sit on a chair, our body exerts a force downward and that chair needs to exert an equal force upward or the chair will collapse. Reason : The third law says that for every action there is an equal and opposite reaction. *

1 point

(a) Both assertion and reason are true and reason is the correct explanation of assertion.

(b) Both assertion and reason are true but reason is not the correct explanation of assertion.

(c) Assertion is true but reason is false.

(d) Both Assertion and Reason are false

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Answer 1

Answer:

(a) Both assertion and reason are true and reason is the correct explanation of assertion.

Answer 2

(a) Both assertion and reason are true and reason is the correct explanation of assertion.

Explanation:

According to third law of motion:

• "For every force of action, there is an equal and opposite reaction"
• Force always comes in pair, action-reaction pair.
• The magnitude of force that is involved in action-reaction is same but direction in which they are exerted is different.

• Sitting on a chair exerts a force of $mg$ which is the force being exerted due to gravity. This force is in applied in the form of weight. $m$ is the mass of the body and $g$ is the gravitational acceleration.

• Since there is contact between the body and and chair, there is another force that the chair exerts on the body which is opposite in direction i.e. upwards and equal in magnitude according to the third law of motion.

• The upward force acts in the form of normal which is perpendicular to the surface.