2018年高考物理一轮总复习实验专题实验一用光电门测量瞬时速度课件鲁科版必修1.ppt

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必修一: 1.用光电门测量瞬时速度,1.全程解读,2.考点考法,辅助阅读 课堂演示实验,1.全程解读,(1)实验原理,(2)物理思想,(3)深入探究,2. 考点考法,【例1】如图示,让滑块沿倾斜的导轨做加速运动。事先在滑块上固定遮光片,当遮光片的宽度s很小时,可认为滑块通过光电门的平均速度是_。某次实验时,测得遮光片的宽度为5 cm,通过光电门的挡光时间为2102 s,则滑块通过光电门时的瞬时速度为_m/s。,考法 基本原理方法的考查,解析显隐,瞬时速度,2.5,考法 光电门极限思想的考查,光电门利用的是极小位移的平均速度来代表瞬时速度,位移越小,此平均速度就越趋近于瞬时速度,此考查在很多探究性实验中都有涉及。,

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