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高中物理中测万有引力常数时,用卡文笛许的方法不仅由于测试时间太长有困难,而且从扭摆的周期求出恢复力在理论上也是不容易的,因此用长周期的扭摆,在短时间内对小的转角测出由于万有引力产生的加速度(那时吊丝的扭转变化在求万有引力常数时可忽略不计)就能在课堂上用几分钟的时间测定和计算。在扭摆一端的重物(小球)上装上一个显微镜用物镜测微器,用电视显微镜可看到测微器并测定加速度,如果在测定开始时有初速度则物镜测微器在视野范围内的时间就变短、测定精确度变差,所以有必要有一个
When measuring the gravitational constant in high school physics, using the method of Cavison not only makes it difficult to test for a long time, but it is also not easy to find the restoring force from the cycle of torsion. Therefore, with a long-periodic torsion, it is short. Within a short period of time, the acceleration due to the gravitational pull is measured for small corners (when the torsion change of the sling is negligible when calculating the gravitational constant), it can be measured and calculated in the classroom in several minutes. A microscope objective micrometer is mounted on the weight (ball) at one end of the wiggle. The micrometer can be seen with a television microscope and the acceleration is measured. If there is an initial velocity at the beginning of the measurement, the objective micrometer is in the field of view. The time becomes shorter and the accuracy of the measurement becomes worse, so it is necessary to have a