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A man is standing on a uniform plank of mass 20 kg and 6 m long. He is standing 1 m from the string at A.
a) Find the unknown forces FA and FB. (Ans: Fa = 550 N and FB = 250 N)
The man now walks to the left of A.
b) Determine the maximum distance in which the man can move before the plank topples. (Ans: d = 0.67 m)
A short-cut is to think about a couple who are in love or quarrel.
When in love, both are walking together in one direction holding hand (i.e. current in both wires are in same direction). Hence there is ATTRACTION between them.
When the couple quarrel, both are walking in opposite direction (i.e. current in opposite direction). Hence there is REPULSION between them.
Answer: Option B