If torque is taken relation with reference point and this point is displaced, the condition of rotation be valid? Statement true or false
Answers
Answer:
couple is defined as: "Two parallel forces with the same magnitude but opposite in direction separated by a perpendicular distance d", and the moment of the couple is: F∗d. In the right sketch the points of F1,F2 are B, A and are at distance r = 2m(Arm of the lever) from the point of rotation O (Fulcrum of the lever).
In the sketch on the right you see that the magnitude of moment of the couple F1,F2 is the product of F (6 N) by the distance d (4 m) = 24 Nm. The magnitude is the sum of the magnitudes of the torques 12 + 12 (N). The point of rotation O is not mentioned but is in the middle. The moment of the couple on the right is equivalent to a torque which is twice the black arrow (12 *2)
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As you can see on the sketch on the left, r is the distance between the point where force is applied P and the fulcrum (F) or the point of rotation O: the centre of the circle having radius r. Saying that the 'torque depends on r' you are implicitly saying that it depends on the choice of the point of rotation. The choice of radius determines the axis of rotation and vice versa