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प्रश्न
State when the moment of force is positive and when it is negative.
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उत्तर
If the couple has a tendency to rotate the body in an anti-clockwise direction then its moment is taken positive and if the tendency of rotation is clockwise then the moment is negative.
संबंधित प्रश्न
What is the SI unit of the moment of force?
A force is applied on (i) a non-rigid body and (ii) a rigid body. How does the effect of the force differ in the above two cases?
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State Newton's Second law of motion. Under what conditon does it take the form F = ma?
Give two examples of a couple's actions in our daily life.
Write the expression for the moment of force about a given axis.
State one factor on which the magnitude of a non-contact force depends. How does the magnitude of a non-contact force change along with distance?
The diagram shows wheel O pivoted at point A. Three equal forces F1, F2 and F3 act at point B on the wheel.

- Which force will produce maximum moment about A?
- Give a reason for your answer in (a).

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- If this rod is cut at the center, C, then compare the weight of AC to the weight of BC. (Use >, < or =)
- Give a reason for your answer in (a).
