1.

A man is standing against a wall such that his right shoulder and right leg are in contact with the surface of the wall along his height. Can he raise his left leg at this position without moving his body away from the wall? Why? Explain.

Answer»
  • When the right leg and right shoulder are in contact with the surface of the wall along the height of a man, his weight is towards the wall. 
  • The centre of gravity will be away from the foot. Just like in the case of carrying a bucket full of water with one hand. 
  • The line joins the centre of gravity and centre of equilibrium is not perpendicular to the horizontal. 
  • Hence he cannot lift his left leg without moving his body along the wall.


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