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what do you understand by weightlessness? give one example |
| Weight of a body is the reaction it exerts on its support.If a person of mass m is standing inside a lift the reaction he exerts on the floor of the lift is R = mg.When the lift moves down with a acceleration a,the reaction,R = m(g - a).If the suspension cable of the lift snaps it has a free fall and in this case a = g.the reaction R = m(g - g) = 0.The person feels apparently weightlessness. |
