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Mechanical advantage greater than one means that a small effort can be used to lift a large load .
Centre of Gravity o
The centre of gravity of a body is that point where the total gravitational torque on the body is zero . o
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The centre of gravity of the body coincides with the centre of mass in uniform gravity or gravity-free space .
If g varies from part to part of the body , then the centre of gravity and centre of mass will not coincide .