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2017年,在临邑县第二中学的校园内,一座新教学楼拔地而起。在热火朝天的建筑工地上,初三四班物理兴趣小组的同学们经过长时间的观察发现,从打地基开始一个建筑机械便成了主角,它可以伸出长长的金属臂,将水泥源源不断地送出。究竟是什么力量这么神奇,竟能支撑起几十米甚至上百米长的金属臂呢?这个问题激发了同学们极大的好奇心。物理老师引导同学们仔细观察,发现在金属臂的下端有一个可以伸缩的金属棒支撑着金属臂,而
In 2017, a new teaching building rises up on the campus of the Second Middle School in Linyi County. In the busy construction site, students of Physical Education Subcommittee at the first, third and fourth classes found that after a long period of observation, it was found that starting construction of a construction machine from the ground became the protagonist. It could extend long metal arms and keep cement flowing Sent. What kind of power is so magical, can actually support tens of meters or even a hundred meters long metal arm it? This issue inspired the students great curiosity. The physics teacher led the students to observe carefully and found that there was a retractable metal rod supporting the metal arm at the lower end of the metal arm.