问题 应用设计题

(6分)请按题目要求作答:

⑴ 下图甲是一种门锁把手的示意图。O点是把手的转轴,请画出作用力F的力臂L。

⑵ 如图乙所示是一个已知N、S极的通电螺线管,在图中标出通电螺线管外部磁感线(虚线)的方向和电源的正、负极.

⑶ 如图丙所示,足球在水平草地上向右减速滚动,请画出足球受到所有力的示意图.

  

答案

题目分析:力臂是支点到力的作用线的距离,见上图;磁感线是由N出来回到S极,再由安培定则(用右手握住通电螺线管,让弯曲的四指指向电流方向,大拇指方向即为北极方向)判断电流的方向和电源的正、负极(电源外部电流的方向是由正极流向负极),见上图;足球在水平草地上向右减速滚动,说明受摩擦力的作用,除此之外还受重力和支持力,且重力和支持力是一对平衡力,见上图。

阅读理解

任务型阅读。

      Happiness is for everyone. You don't need to care about those people who have beautiful houses with large

gardens and swimming pools or those who have nice cars and a lot of money and so on. Why? Because those

who have big houses may often feel lonely and those who have cars may want to walk to the country roads in

their free time.

      In fact. Happiness is always around you if you put your heart into it. When you are in trouble at school,

your friends will help you: when you study hard at your lessons, your parents are always taking good care of

your life and your health; when you get success, your friends will say congratulations to you; when you do

something wrong, people around you feel unhappy, too. All these are your happiness. If you notice a bit of them,

you can see that happiness is always around you.

      Happiness is not the same as money. It is a feeling of your heart. When you are poor, you can also say you

are very happy, because you have something else that can't be bought with money. When you meet with

difficulties, you can say loudly you are very happy, because you have more chances to challenge (挑战)

yourself. So you cannot always say you are poor and you have bad luck. As the saying goes, life is like a

revolving (旋转的) door. If you take every chance you get, you can be a happy and lucky person. 

根据短文内容回答下列各题。

1. Those who have big houses may often feel ________.

2. When you fall down in a PE lesson, both your teacher and your classmates will              .

3. What will your friends say to you when you make great progress?

    ________________________________.

根据短文判断正(T)误(F)。

( ) 4. Happiness is always around you though difficulties come toward you.

( ) 5. You can still be a happy person even if you have little money.

( ) 6. You can get help from others when you make mistakes.

( ) 7. People who have cars would never like to walk in the open air.

单项选择题