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| Definition of Torque |
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| Torque is the product of the magnitude of the force and the lever arm of the force. |
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| What is the significance of this concept in our everyday life? |
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| To increase the turning effect of force, it is not necessary to increase the magnitude of the force itself. We may increase the turning effect of the force by changing the point of application of force and by changing the direction of force. |
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| Let us take the case of a heavy door. If a force is applied at a point, which is close to the hinges of the door, we may find it quite difficult to open or close the door. However, if the same force is applied at a point, which is at the maximum distance from hinges, we can easily close or open the door. The task is made easier if the force is applied at right angles to the plane of the door. |
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Motion of Particles and Rigid Body
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