1917年4月，列宁结束了长期的流亡生活，回到彼得格勒，他在火车站广场发表了热情洋溢的演讲，其演讲肯定涉及(  )

列宁回到彼得格勒

力作用在物体上可以改变物体的运动状态．物体运动状态的改变可以是运动快慢的改变，也可以是运动方向的改变，也可以是运动的快慢和方向同时改变．你能从日常生活中找到这样的例子吗？搜集一下，并分析使它们的运动状态发生改变的力，自己设计一个表格，把你搜集和分析得到的信息记录下来．

进一步分析它们运动状态改变的情况和受力的情况，你还能发现什么规律吗？

阅读短文，下列问题

A

    It's two weeks before Christmas in England and Mrs. Smith is very busy. She buys a lot of Christmas cards to send to her friends and to her husband's friends. She puts them on the table in the room. Then, when her husband comes home from work, she says to him, “These are the Christmas cards for your friends. Could you please write the cards and I cook supper?”

    Mr. Smith doesn't say anything and walks into his study. After a while, he comes with a box full of Christmas cards. He puts them on the table and says, “They are from last year. I forgot(忘记) to send them.”