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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 |
| Answer» A. because of parallel friction force | |
| 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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