Why do you tend to lean backward when carrying a heavy load in your arms?
We have to explain the reason behind commonly observed situation of leaning backward when carrying heavy load in ours arms.
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Center of mass of a body is an imaginary point at which whole mass of the body is supposed to be concentrated.
We consider that the net force acts on the centre of mass of body, insteads of considering that it acts on each and every point on the body for simpler calculation.