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在做《用冲击摆测弹丸的速度》这一实验时,有两个实用的小窍门。一、射击前常常需要调节摆线的长度,使之上沿与刻度盘上的虚线对齐,摆块与刻度盘平行。这种调节光靠眼睛来看,只是大约估计,这就不易调好,特别是不能保证弹簧枪射出的弹丸正好射入摆块的弹孔内。这时可以用一根平直度良好的铅笔(长度约18cm),使
There are two practical tricks to use when experimenting with the speed of impact pendulums. First, before the shooting often need to adjust the length of the cycloid, so that the top edge and the dial on the dotted line alignment, parallel to the dial and the dial. This adjustment depends on the eyes, but it is estimated that this is not easy to adjust. In particular, it cannot be guaranteed that the projectile projected by the spring gun will just enter the bullet hole of the pendulum block. You can use a pencil with good straightness (about 18cm in length) to make