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在做“验证机械能守恒定律”的实验时,高中物理《必修本》第一册第258页第三行指出:“在实验中从几条打上点的纸带中挑选第一、二两点间的距离接近2毫米并且点迹清晰的纸带进行测量。”又在下面小字的注释中写到:“打点计时器每隔0.02秒打一次点。自由落体运动在最初0.02秒内下落距离1/2×9.8×0.02~2≈0.0002米=2毫米,所以纸带第一、二点间距离接近2毫米,意味着纸带是在打第一点的瞬间开始下落的。”不少流行的实验题中,也围绕该点进行考查,为此
In the experiment of “Verification of the conservation of mechanical energy”, the third line of page 258 of the first volume of High School Physics “Mandatory Book” states: “In the experiment, the first and second points were selected from several tapes The tape was measured with a distance of approximately 2 mm and a sharply-pointed tape.“ Also in the following small-character commentary: ”The dotting timer makes a point every 0.02 seconds. Free-fall movement falls within 1/0.02 second. Distance 1/ 2 × 9.8 × 0.02 ~ 2 ≈ 0.0002 m = 2 mm, so the distance between the first and second points of the tape is close to 2 mm, meaning that the tape begins to fall at the moment of the first point." Many popular experiments The questions are also examined around this point, for which