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Mr. Dubey • 97.30K Points
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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
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Explanation by: Mr. Dubey
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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