正文 第二十九章 做正确的事(第1页/共3页)
在齐老师的名单中，陆佰属于“特别类”。
李萌特意把陆佰交待给齐老师，而且陆佰的特别给他留下很深的印象。
他不像那些幡然悔悟的学生，上课双眼瞪得像灯笼，下课缠着老师问题，也不像无视高考，上课睡觉，下课精神。
齐老师站住，俯视陆佰。
纸上的物理知识点罗列得井井有条。
‘重力’
‘概念：地球一切物体受地球吸引作用，重力由地球吸引产生。（吸引作用，应该是万有引力，具体等后面章节再返回来看，标记！）’
‘重力的大小：g=g；方向：竖直向下。’
在“竖直向下”的四个字下，陆佰重重划了线：‘竖直而非垂直’
‘重心：物体各部分所受重力等效集中于一点，即重心——此人为定义也。’
‘质量均匀者，重心在几何中心上。’
往后，是弹力，一样的格式，陆佰默写弹力的概念、弹力产生的条件、方向等等。
再往后，是胡克定律、滑动摩擦力、静摩擦力等等。
陆佰写得密密麻麻，背这些东西是很枯燥的，说明他的确下了功夫。
然而
齐老师叹了口气。比如，陆佰在重力的概念旁写下的‘万有引力’云云，这足见陆佰基础之差。
物理老师在讲万有引力一节的时候，必然会联系重力，陆佰上高一的时候只要稍稍听课就不会不知道，重力只是地球与物体之间产生的万有引力的分力，万有引力的另一个分力，则是自转产生的向心力，所以除了赤道上，重力并不指向地心。
只是，在正常题目里，都近似看做指向地心。
有些事情为什么不问问老师呢？
重力的概念细说下去，要联系万有引力和向心力，凭他自己闭门造车，要猴年马月才能理解。
齐老师轻敲陆佰的桌子。
陆佰停下笔。
齐老师俯身，压低声音问道：“力学第一章看完了？”
“是的。”
“我问你，重心一定在物体上？”
“不，比如易拉罐。”
“动摩擦力一定是阻力吗？”
“不是。”陆佰立即回答：“比如在滑动带上”
“好的。”齐老师点点头，他明白意思。
然后，齐老师拿过笔，在陆佰的草稿纸上画了一个半圆，一块细长直的木条搭在圆上，一大半在圆里，一小半在圆外。
“你做一下它们的弹力。”
“这
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