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"In theory, theory and practice are the same. In practice, they are not." ..."Albert Einstein (1879~1955, Mathematical physicist, Nobel Prize 1921-Physics)"
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Author Topic: Why it is easier to hold a rod at it's center of gravity  (Read 9328 times)
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Fu-Kwun Hwang
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on: February 25, 2007, 11:48:57 am »

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Initially, a rod with mass of 20, your hand is located at it's center of gravity.
So you only need to apply 10+10=20 upward force to hold the rod.

Drag your hand to other location horizontally and you will need to apply much more forces to the rod to hold it in static equilibrium.
The sum of those two forces much balanced with the weight of the rod.
And the sum of the torques need to be zero in order to have static equilibrium condition.



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"In theory, theory and practice are the same. In practice, they are not." ..."Albert Einstein (1879~1955, Mathematical physicist, Nobel Prize 1921-Physics)"
 
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