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铅笔是每个学生必备的文具,利用它可以做许多中学物理实验,现举例作些介绍。实验一、特殊刻度尺。在铅笔杆上,分别刻出1毫米、5毫米和10毫米间距的浅槽,利用它们可以测量细铁丝、头发、细线等物的直径。在相应浅槽内紧绕十余圈,数出圈数除槽的宽度,即求得上述被测物的直径。实验二、自制弹簧秤。把一细纲丝用力紧密地排绕在铅笔杆上,放松后即成一弹簧,将其上端固定在铅笔上,在下端弯一小
The pencil is a must-have for every student. It can be used for many middle school physics experiments. An example is given here. Experiment 1, special scale. On the pencil shaft, shallow grooves of 1 mm, 5 mm, and 10 mm are carved, and the diameters of fine iron wires, hair, and thin wires can be measured. In the corresponding shallow groove around more than ten laps, count the number of laps in addition to the width of the groove, that is to obtain the diameter of the measured object. Experiment two, self-made spring balance. A thin wire is tightly wound around the pencil rod. After it is relaxed, it is a spring. Fix the upper end of the wire on the pencil and bend it at the lower end.