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Suppose we define a quantity 'Linear Pomentum' as Linear Pomentum = mass x speed. The linear pomentum of a system of particles is the sum of linear pomenta of the individual particles. Can we state a principle of conservation of linear pomentum as "linear pomentum of a system remains constant if no external force acts on it"? |
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Answer» Let us consider a system of two particles of equal mass with equal speed but in opposite directions on a straight line. The center of mass of the system will remain stationary. So the speed of the center of mass = 0. Hence linear pomentum of the CoM = MxV =0. But from the definition linear pomentum of the system = mv+mv = 2mv. Hence we can not state such principle. (Since speed v is scaler, we consider only the magnitude). |
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