While rotating an object or while opening a door or a water tap we apply a force or forces. under which conditions is this process easy for us? Why? Define the vector quantity concerned. How does it's differ for a single force and for two opposite forces with different lines of actions?
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Rotating an object like a water tap can be done with ease if the two forces are equal in magnitude but opposite in direction are applied along different lines of action. The ability of a force to produce rotational motion is measured by its turning effect called 'moment of force' or 'torque'.
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