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What is the moment of a couple ? State any three characteristics of a couple . Give any one illustration for a couple. |
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Answer» Solution :The PRODUCT of magnitude of any one force and arm of the couple is known as moment of a couple. Characteristics : (1) Moment of a couple does not depend on the position of the point about which the body rotates. (ii) A couple ALWAYS produces a ROTATORY motion of the body. (3) A single force cannot balance or neutralise a couple. A couple is required to balance a couple, acting on a body. (4) If the restoring couple balances the deflecting couple, then the body is in a STATE of rotatory equilibrium. Illustration of a couple (1) openings or closing of a lid of a threaded neck of a bottle (2) The rotation of a freely suspended magnetic needle experience a couple due to Earth's magnetic FIELD. |
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