M

Mr. Dubey • 52.30K Points
Coach 

Q. Why is climbing a lamp post harder than climbing up a tree?

(A) because of parallel friction force
(B) because of contact force between the bodies
(C) because of van der wall’s force
(D) because of rope force
Correct : Option (A)

Explanation: 
 sometimes, the electromagnetic contact force between two bodies may have a component acting parallel to the surface of contact. this is called friction. when bodies are placed with their smooth surfaces in contact, they provide only a small parallel component of contact of force and hence

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