Assertion and Reason on Insect Climbing a Wall – Rankers Physics

Friction: Practice Problem & Solution

Assertion (A): An insect is climbing up a vertical wall with constant speed then the force applied by the wall on the insect is vertically upwards and equal to its weight. Reason (R): Friction is a self-adjusting force.  
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(A) is true but (R) is false
Both (A) and (R) are false

Short Solution (Best for NEET):

To solve this problem, we apply the core principles of Friction. Understanding the underlying formula is key to arriving at the correct answer below:

For an insect climbing at constant speed, the upward friction force component from the wall must balance its weight. Static friction is indeed a self-adjusting force. Both A and R are true statements, and R explains why the friction force can adjust to balance the weight.

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