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高中物理(甲种本)296页图示摆的共振装置,看来简单,其实不然。因为需要一个结实的支架,才能把绳张紧;纵使绳子张得很紧,各摆所受的策动力也不完全一致,不便演示。虽然许多物理刊物提出过改进做法,但都没有改进张绳的问题。现在改进后的装置, 克服了张绳的缺点。结构如附图所示。用一段水平铁丝、两端带钩代替张紧的绳,钩到一个支架的横铁杆上。其他各摆球的吊法与原装置相同。注意点,为了加强策动力,摆球A的质量可加重一倍。带钩的水平铁丝宽可50厘米左右,不要太软,钩与横铁杆的接触不要太紧,只要挂上后,两端的接触基本一致即可。演示时,策动摆球A,方向不偏,可明显地看到其他各摆球振动是共振与否的现象。
High school physics (a type of book) page 296 shows the pendulum’s resonant device. It seems simple, but it is not. Because of the need for a strong support, the rope can be tensioned; even if the rope is tight, the power of the pendulums is not exactly the same, so it is not convenient to demonstrate. Although many physical publications have proposed improvements, they have not improved the issue of the ropes. The improved device now overcomes the shortcomings of Zhang Sheng. The structure is shown in the figure. Use a horizontal wire, with hooks at both ends instead of the tensioned rope, and hook it to the horizontal iron bar of a bracket. The hanging method of other pendulum balls is the same as the original device. Note that in order to strengthen the driving force, the mass of pendulum ball A can be doubled. The hooked horizontal wire can be about 50 centimeters wide. Do not be too soft. The hooks should not be too tight in contact with the horizontal irons. After they are hung, the contact at both ends is basically the same. During the demonstration, invigorating the pendulum ball A, the direction is not biased, and it can be clearly seen that the vibrations of other pendulum balls are resonance or not.