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1 (vil) The centre of mass of a system of particles| (a) coincides always with the centre of gravity.(b) never coincides with the centre of gravity.(c) coincides with the centre of gravity only in a uniformgravitational field. |
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Answer» Centre of mass:It is the point where whole mass of the body is concentrated. If an external FORCE is applied on COM , it torque will be zero.Centre of gravity:It is the point where the torque of gravitational force is zero.COM and CAG mag or mag not coincidescouple only produces rotation, no translation Mechanical ADVANTAGE = Input forceoutput force If it is grater than 1Output > 1 inputSo, less effort is required to LIFT LARGE low |
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