问题 问答题

请你观察图中的三个奥运比赛项目的图片,想象图片中运动比赛的情景,提出一个物理问题,并对提出的物理问题进行解答。

 问题解答
例句篮球放入篮筐中为什么会下落?投入篮筐内的篮球受重力作用而下落
   
 

答案

用力踢球后,球的运动方向为什么会改变?力改变了足球的运动状态。要使赛艇在水中匀速运动,还需要用力划桨吗?船受阻力,要使船匀速运动,还需要用力划桨。(合理得分)

题目分析:力的作用效果有两个:一是力可以改变物体的运动状态,二力可以改变物体的形状。作匀速直线运动的物体受到平衡力的作用。

阅读理解

阅读理解。

     阅读下列应用文及相关信息,并按照要求匹配信息。首先请阅读下列警方通报查

找人员的信息:

     以下是相关事件及人物的描述,请把描述与相关插图及提示性文字匹配起来.

1. A valuable dog was taken while being walked by its owner in City Park yesterday afternoon.

Police wish to talk to a man seen nearby at the time, described by witnesses as short and fat with

short light hair and clear glasses.

2 Yesterday morning at 9.30a.m. a man armed with a gun entered the National Bank and

demanded money from the staff, before fleeing when confronted by bank security staff. Security

cameras show the man as being short and thin with shoulder length blonde hair.

3. A tall, strong built man with blonde hair, a thick black moustache and wearing dark glasses

knocked a woman to the ground and stole her purse on Main Street last Saturday afternoon. If

you see this man, do not approach as he is considered extremely dangerous.

4. At the football match between Manchester United and Liverpool, several people had their

wallets stolen while waiting in line to buy food. The victims did not see or notice the thief but

bystanders describe him as very tall and thin, clean shaven with short light hair.

5. A car was stolen from the supermarket carpark on Friday, June 23 this year by a man

described as very young, 1.7 metres tall with thin dark hair and carrying a blue backpack.

A reward of $500 is offered for the car's recovery.

单项选择题 B1型题