【英语时差8,16】如何计算停车时间与距离-上

 As you are driving along, some part of your mind is probably constantly estimating how much space you would need to brake if the car in front of you suddenly stopped. All too often, however, drivers don’t realize the difference between stopping time and stopping distance. Let’s figure it out. First, let’s assume the road is a uniform surface.Let’s also assume the stopping car is skidding² to a halt, so its speed decreases uniformly. Now suppose–just as a guess–a car going thirty takes four seconds to skid¹ to a halt. How long will it take at sixty? Did you say eight seconds? Correct. As you would expect, twice the speed equals twice the stopping time.

1 skid   

v.打滑 n.滑向一侧；滑道 ，滑轨

参考例句：

• He braked suddenly,causing the front wheels to skid.他突然剎车，使得前轮打了滑。
• The police examined the skid marks to see how fast the car had been travelling.警察检查了车轮滑行痕迹，以判断汽车当时开得有多快。

2 skidding   

n.曳出，集材v.（通常指车辆） 侧滑( skid的现在分词 )；打滑；滑行；（住在）贫民区

参考例句：

• All the wheels of the truck were tied up with iron chains to avoid skidding on the ice road. 大卡车的所有轮子上都捆上了铁链，以防止在结冰的路面上打滑。 来自《用法词典》
• I saw the motorcycle skidding and its rider spilling in dust. 我看到摩托车打滑，骑车人跌落在地。 来自互联网