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Sir in man and plank type problems in centre of mass there is a line that the the net force in horizontal direction is zero. Plz explain this.

Sir in man and plank type problems in centre of mass there is a line that the the net force in horizontal direction is zero. Plz explain this.

Grade:12th pass

1 Answers

KC
24 Points
6 years ago
Assume (plank + man) as one system. The force of friction between them becomes an internal force as we assume them to be part of the same system. Also, other forces like weight and normal reaction are in the vertical direction. So if the plank is kept on a frictionless surface, the net external horizontal force acting on (plank + man) system is zero.

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