一、控制变量法当要研究的一个物理量与另外几个物理量都有关系时,为简化和方便,先研究与其中一个量的关系,而要控制其余几个量不变。这种研究问题的方法叫控制变量法。控制变量法是物理中应用最广的研究方法。例1在学习吉他演奏的过程中,小盼发现琴弦发出声音的音调高低是受各种因素影响的,她决定对此进行研究,经过和同学们讨论,提出了以下猜想: First, control variable method When a physical quantity to be studied is related to several other physical quantities, for the sake of simplicity and convenience, the relationship with one of the quantities is first studied, and the remaining quantity is to be controlled. This method of studying the problem is called the control variable method. The control variable method is the most widely used research method in physics. Example 1 During the course of learning guitar playing, Xiao Pan found that the tone of the sound produced by the strings was affected by various factors. She decided to conduct research on this and after discussions with her classmates, he came up with the following conjecture: