【英语时差8,16】驾驶室内发生的有趣事情
时间：2015-10-15 06:40:46
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（单词翻译）
You're driving along on your way to deliver some helium balloons to a birthday party. Suddenly you hit the brakes. As your car rapidly decelerates, you feel yourself pushed up against the wheel. Why? That one's probably not too tough. Although you may think you are sitting still when driving, your body is moving forward at the same speed as the car itself. So, when you hit the brake the car slows down but your body is still trying to go forward. You experience a sensation something like being pressed against the front of the car.
The next question is a little
trickier1. Which direction did the balloons move?
Think for a second. The car is going forward and
abruptly2 stops. Which direction do the balloons go?
Surprisingly, if you've ever had this experience you might have noticed that the balloons move
backwards3 -- just the opposite of your body. Why?
It's because the balloons are floating in the air that fills the car. The air itself is subject to the same
acceleration4 as your body. When you hit the brakes, the air continues moving forward the same way you do. More air gets pushed to the front than
remains5 in the back. So there is momentarily greater air pressure at the front of the car. The floating balloons register this by being pushed backwards.
You can try this with a candle inside a glass container. Push the container forward and then stop. The flame will
tilt6 backward! The air inside has been accelerated so that it
briefly7 crowds one end of the container, forcing the candle flame back toward the area of lower pressure.
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