问题 应用设计题

(1)如图所示为足球运动员顶出去的足球,试画出足球在空中飞行时的受力示意图(不计空气阻力)。

(2).请在如图所示中画出两磁极间磁感线的分布并标明方向。

(3).在下面的方框内画出伏安法测电阻的电路图,并根据电路图连接电路。

答案

(1)如图所示:

(2) 如图所示:

(3)如图所示:

题目分析:(1)过球心作竖直向下的重力.如图所示:

(2)根据磁感线在磁体的周围是从N极出来,回到S极可进行作图;如图所示:

(3)伏安法测灯泡电阻,电源、滑动变阻器、电阻、电流表、开关组成串联电路,电压表并联在待测灯泡两端,电路图及实物图如图所示;

点评:重力的方向总是竖直向下的;规则物体的重心在物体的几何中心;会用力的示意图表示重力的作用点和方向.

本题考查了磁感线的特点.以及磁感线的作图,要牢记磁场的方向.

本题考查电路图的设计及实物图的连接,应明确实物图连接中所要注意的事项.

单项选择题
阅读理解

Going to the park with your family is a time-honored tradition during the warmer months whether you live in the city or in a rural area. The most common thing for kids to do at the park is to play on the playground equipment. This is great for kids. For parents, however, playground time is something not quite as exciting. It’s nice to socialize with other parents and enjoy watching the little ones at play, but grown-ups can’t easily participate in the playground fun. In order to make the most of spring and summer park trips parents might want to consider trying a few new activities.

Soft Frisbees and balls are great things to bring to the park and enjoy with kids. Parents can participate in playing catch. They can enjoy the fresh air and physical activity together. Other lawn games and toys like badminton can easily be taken to the park for an afternoon of fun.

If it is a breezy day, it might be just perfect for flying a kite. Kite flying is a wonderful family fun activity. Children who are too small to fly a kite themselves can have fun chasing it and helping older siblings hold the string. Slightly older children can enjoy learning to fly kites. Teens and parents can enjoy the challenge of making kites. Best of all, kites are inexpensive and can be used in almost any open space on a breezy day.

After these, the first thought might be to head home for a meal or a snack. However, bringing a snack or having a picnic can add an exciting element to the day out and can allow the family to enjoy more park time together. Everyday foods like sandwiches and apples can be very appetising. If you decide to pack a picnic, just remember to bring bags for any garbage you might produce!

小题1:Why is the playground time not quite exciting for parents?

A.There is no equipment for them.

B.They can’t interact with each other.

C.They can’t easily enjoy the fun.

D.They have to watch their kids.小题2:What does the underlined word “appetising” in the last paragraph probably mean?

A.Convenient.

B.Delicious.

C.Expensive.

D.Terrible.小题3:What can the smallest kids do with kites?

A.Make a kite.

B.Fly a kite.

C.Watch a kite.

D.Chase a kite.小题4:What is the main idea of the passage?

A.The benefits of parents playing with children.

B.Suitable weather for playing in the park.

C.Activities parents can do with their children in the park.

D.Kite flying during spring and summer.