牛顿第一运动定律在教材中没有安排演示实验,而通常的演示大多是在气垫导轨上进行。我们设计该演示实验不仅可以取代气垫导轨,而且取材容易,操作简单,可见度大,还可在任意方向上演示第一定律,克服了在气垫导轨上演示的固有缺点。具体介绍如下。1 实验器材与准备1.1 实验器材节拍器一只,废旧日光灯管(如30W)一支,能浮在白油上的手电筒用小电珠(如6.3V)一只,固 Newton’s first law of motion does not arrange demonstration experiments in the textbooks, and most of the usual demonstrations are performed on air-cushioned rails. We designed the demonstration experiment to not only replace the air-cushion guide, but also has easy material acquisition, simple operation, large visibility, and can demonstrate the first law in any direction, which overcomes the inherent shortcomings demonstrated on the air-cushion guide rail. The details are as follows. 1 Experimental equipment and preparation 1.1 A metronome of experimental equipment, a used fluorescent tube (such as 30W), a flashlight that can float on white oil with a small bead (such as 6.3V),