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Why are car seat-belts designed to stret...

Why are car seat-belts designed to stretch somewhat in a collision ?

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So that by stretching somewhat the seatbelt allow the large momentum of a passenger to reduce gently, the passenger is prevented fro thrown forward violently, and injury is prevented (or reduced) during a collision
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LAKHMIR SINGH & MANJIT KAUR-FORCE AND LAWS OF MOTION-Exercise
  1. Which of the following situations involves the Newton's second law of...

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  2. To catch a fast cricket ball, a player pulls his hands backwards. Why ...

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  3. Why are car seat-belts designed to stretch somewhat in a collision ?

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  4. The troops (soldiers) equipped to be dropped by parachutes from an air...

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  5. Why would an aircraft be unable to fly on the moon ?

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  6. Explain why it is possible for a small animal to fall from a considera...

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  7. A boy of mass 50 kg running at 5 m/s jumps on to a 20 kg trolley trave...

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  8. A girl of mass 50 kg jumps out of a rowing boat of mass 300 kg on to t...

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  9. A truck of mass 500 kg moving at 4 m/s collides with another truck of ...

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  10. A ball X of mass 1 kg travellingg at 2 m/s has a head-on collision wit...

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  11. A heavy car A of mass 2000 kg travelling at 10 m/s has a head-on colli...

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  12. A man wearing a bullet-proof vest stands still on roller skates. The t...

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  13. Which of the following has more inertia ? (a) a rubber ball and a st...

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  14. In the following example,try to identify the number of times the veloc...

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  15. Explain why some of the leaves may get detached from a tree if we vigo...

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  16. Why do you fall in the forward direction when a moving bus brakes to a...

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  17. If action is always equal to the reaction, explain how a horse can pul...

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  18. Explain, why is it difficult for a fireman to hold a hose, which eject...

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  19. From a rifle of mass 4kg, a bullet of mass 50g is fired with an initia...

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  20. Two objects of masses 100g and 200g are moving along the same line in ...

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