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物理实验的器材选取及其加工

作者:潘广银  人气: 1457 次  时间:2009年09月26日  星级:

  我们都知道,实验器材是限制物理实验课教学的瓶颈,要体现物理是有趣的,而且是有用的,就离不开实验;要验证某个规律或得到某个结论,也需要进行实验,而实验就必然需要相应的器材。在偏远的乡村中学,由于受编制配置、教学内容调整等影响,实验器材往往比较贫乏,我们就要创造条件做实验,因地制宜地开展“造”器材的活动,而如何选取恰当的器材,就显得十分重要。下面我就举两个例子加以说明。
  在探究气体的压强与流速的关系实验中,如果由教师用现成的玻璃漏斗来演示“用漏斗吹球不掉的实验”,学生在观察到球不掉的同时,也看到球在转动!于是,同学们私下可能会想:球不掉可能还与旋转有关!事实上,我们的确无法在课堂上实现直接把乒乓球给吹起来,特别是水平方向一吹,球便跑掉了。要是用管斜向上对乒乓球持续吹气,球会在空中旋转,且球不会掉下来(图1),同学们就会更加相信前面的观点──与旋转有关!如果由学生自己来探究,一方面器材不足,另一方面也不是很安全(要把玻璃管含在口中)。所以我们就把塑料瓶加工成“漏斗”,既可以保证学生人手一个,又可以按照我们的需要进行加工(图2),做起实验来就比较顺手了:由于我们使用了瓶底做“斗”(图2中的A),乒乓球与斗壁不能充分接触,吹气时球就不会转了;如果做向上吹球的实验(图3),球也不易吹起来。当然,这样做不是进行掩盖,而是尽量排除干扰因素!
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