问题 填空题

现代社会的交通网遍布全球,它与人的生活密切相关,交通中的许多问题跟物理知识有关,其中汽车是重要的运输工具.请你将与汽车的部件相联系的物理知识写在对应的横线上:

例如  汽车的发动机---→______;

载重汽车一般安装较多车轮---→______

汽车车轮上的花纹---→______;

汽车的安全带---→______.

答案

汽车的发动机为汽油机,发动机工作时,将燃料燃烧产生的内能转化为机械能.

载重汽车安装较多的车轮是在压力一定时,增大受力面积减小对地面的压强,保护路面.

轮胎上有凸凹不平的花纹是在压力一定时,增大接触面的粗糙程度来增大摩擦力.

一切物体都具有惯性,汽车刹车时,如果没有安全带的保护,驾驶员会因为自身惯性向前运动而发生事故.所以安全带起到保护人体的作用,防止惯性带来的伤害.

故答案为:能量的转化;减少压强;增大摩擦力;惯性.

选择题
填空题

[A] Advertisements add interests to life

[B] Advertisements help to save money

[C] Criticisms on advertisers

[D] Usefulness of small advertisements

[E] True aesthetic value of advertisement

[F] Informing: the chief function of advertising

41__________

Advertisers tend to think big and perhaps this is why they’re always coming in for criticism. Their critics seem to resent them because they have a flair for self-promotion and because they have so much money to throw around. "It’s iniquitous," they say, "that this entirely unproductive industry (if we can call it that) should absorb millions of pounds each year. It only goes to show how much profit the big companies are making. Why don’t they stop advertising and reduce the price of their goods After all, it’s the consumer who pay..."

42__________

The poor old consumer! He’d have to pay a great deal more if advertising didn’t create mass markets for products. It is precisely because of the heavy advertising that consumer goods are so cheap. But we get the wrong idea if we think the only purpose of advertising is to sell goods. Another equally important function is to inform. A great deal of the knowledge we have about household goods derives largely from the advertisements we read. Advertisements introduce us to new products or remind us of the existence of ones we already know about. Supposing you wanted to buy a washing machine, it is more than likely you would obtain details regarding performance, price, etc. , from an advertisement.

43__________

Lots of people pretend that they never read advertisements, but this claim may be seriously doubted. It is hardly possible not to read advertisements these days. And what fun they often are, too! Just think what a railway station or a newspaper would be like without advertisements. Would you enjoy gazing at a blank wall or reading railway laws while waiting for a train Would you like to read only closely-printed columns of news in your daily paper A cheerful, witty advertisement makes such a difference to a drab wall or newspaper full of the daily ration of calamities.

44__________

We must not forget, either, that advertising makes a positive contribution to our pockets. Newspapers, commercial radio and television companies could not subsist without this source of revenue. The fact that we pay so little for our daily paper, or can enjoy so many broadcast programs is due entirely to the money spent by advertisers. Just think what a newspaper would cost if we had to pay its full price!

45__________

Another thing we mustn’t forget is the "small ads." which are in virtually every newspaper and magazine. What a tremendously useful service they perform for the community! Just about anything can be accomplished through these columns. For instance, you can find a job, buy or sell a house, announce a birth, marriage or death in what used to be called the "hatch, match and dispatch" columns; but by far the most fascinating section is the personal or "agony" column. No other item in a newspaper provides such entertaining reading or offers such a deep insight into human nature. It’s the best advertisement for advertising there is !

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