CBSE Class 11-science Answered
If you have to lift a long board, common sense prompts you to pick up the long boardat its center because it balances more easily and is more easily handled.
Some of the physical ideas behind this common sense are that the weight effectively acts at the center of mass, and you don't have to exert extra torques to keep the board in equilibrium. If it is supported at the center, the weight of the board has a zero lever arm with respect to the point of support.
while if held at the end the lever arm becomes maximum possible,and one has to exert extra force to hold it.
We hope this clarifies your doubt.
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