Question

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 with his height. Can he raise his left leg at this position without moving his body away from the wall? Why? Explain.

Answer 1

Hint: In this question, we should have knowledge of the Centre of gravity. First of all, we should try to stand near a wall and our right shoulder and right leg contact with the wall surface and then try to raise our left leg at this position, such that we see that it's not possible due to COG(Center of gravity).

Complete step-by-step solution:
Center of gravity:-
The centre of gravity (COG) of the human body is a hypothetical point around which the force of gravity appears to act. It is the point at which the combined mass of the body appears to be concentrated. Because it is a hypothetical point, the COG need not lie within the physical bounds of an object or person.
No, the man does not raise his left leg at the position without moving his body away from the wall because the Centre of gravity moves away from the base support this makes the man in an unstable position when we move our body away from the wall.
Hence the correct answer:- No

Note: The figure below depicts this.
Gravity is nearly at the belly point. In this situation, he can’t raise his left leg. Because if he raises the left leg, the center of gravity moves. Then he must move his body parts to maintain the center of gravity. Therefore as he raises his left leg he has to move his other body parts. The figure below depicts this.