Module 3 - Moments and Couples

# Module 3 - Moments and Couples - Moments and Couples n n n...

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Moments and Couples n Moment is a form of force that causes rotation n It is a form of torque which tends to make rotation n Moment is present whether there is actual rotation or a tendency to rotate n If a force is acting some distance away from a point, such as fulcrum of a lever, it causes a twisting action about the point. This twisting action is called moment

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Magnitude of Moments? n Magnitude of moments depends upon both the size of the force and the perpendicular distance from the force to the point n Moment = Force x the perpendicular distance between the axis and the line of action of the force n In two-dimensional drawings – the axis appears as a point
Sign of Moment n Moments are vector quantities, so the direction must be indicated n There is no hard and fast rule about the moment n In your book, the moment which tends to rotate the body in counter clockwise direction, is taken as positive moment n The moment which tends to rotate in clockwise direction is taken as negative n You can follow any convention, as long as you are consistent

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## This note was uploaded on 02/07/2011 for the course ENG 16764 taught by Professor Artur during the Spring '11 term at Sheridan College.

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Module 3 - Moments and Couples - Moments and Couples n n n...

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