The moment of force directly proportional to the force and perpendicular distance of force from the axis of rotation. For a given moment of force, smaller force is required if it is applied at a longer distace from the axis of rotation. To open the door with least force ,handle is fitted near its edge.
Which is always constant for a machine of given design: MA or VR ? Ans: VR remains constant for a machine of given design as it depends on the distances moved by the load and effort but MA can vary due to the friction developed between the moving parts of the machine.
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