本题目来源于试卷: gc textbook chapter 7 Linear Momentum，类别为 通用国际物理
[问答题]
According to Eq. 7–5, the longer the 8 h rl iwy,t(q;5j(sxn- ow4rjimpact time of an impulse, the sma jjr cuy-ckpf:-+n(0m otv2z -ller the force can be for the same momentum change, and hence the smaller the deformation of the object on which the force acts. On this basis, explain the value of air bags, which are intended kjp u-jr(yz0fc +c:mv--no t2 to inflate during an automobile collision and reduce the possibility of fracture or death.
参考答案:
The air bag greatly increases the amount of time
over which the stopping force acts on the driver. If a hard object like a steering wheel or
windshield is what stops the driver, then a large force is exerted over a very
short time. If a soft object like an air
bag stops the driver, then a much smaller force is exerted over a much longer
time. For instance, if the air bag is
able to increase the time of stopping by a factor of 10, then the average force
on the person will be decreased by a factor of 10. This greatly reduces the possibility of
serious injury or death.
本题详细解析:
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