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A block with mass m is supported by cord C from the ceiling, and a similar cord D is attached to the bottom of the block (Fig. 3-21). Explain this: If you give a sudden jerk to D, it will break, but if you pull on D steadily, C will break.
As you sudden jerk to D, the time of impact of force acting on the block is less. So the tension exerted on the block due to the down ward external force exerted by the cord D will be less. Thus, in this case less energy will transfer to the chord C. Therefore if you give a sudden jerk to D, it will break. But if you pull on D steadily, the time of impact of force acting on the block is more. So the tension exerted on the block due to the down ward external force exerted by the cord D will be more. Thus more energy will be transfer to the cord C. Therefore if you pull on D steadily, C will break.
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