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高中物理课本(上册)中的学生实验五、六、八,都是用打点计时器。做实验时,常发生一些问题:(一)纸带上的点迹不清晰,甚至中途无点。(二)纸带后段的点,打点片不是每秒钟打50次。(三)打点针对纸带运动的阻力大,较明显地影响了纸带做匀速直线运动和匀变速运动。(四)没有交流电的地方,三个学生实验不能做。(五)要配上降压器,装置麻烦,花钱多。因此,我设计制作了划线计时器来代替打点计时器。实验效果比打点计时器好。没有交流电
Students’ experiments in the high school physics textbook (volume I), fifth, sixth, and eighth, are all using a tick timer. When doing experiments, some problems often occur: (a) The spots on the tape are not clear, even in the middle. (b) At the back of the tape, dots are not played 50 times per second. (3) The resistance to tape movement is large, which obviously affects the uniform linear motion and even variable speed motion of the tape. (4) Three students cannot do experiments without alternating current. (five) to be equipped with a pressure reducer, device trouble, spend more. Therefore, I designed a scoring timer instead of a tick timer. The experimental results are better than the dot timer. No AC