剪刀是我们日常生活中常用的工具，但你可别小看它，里面可包含着丰富的物理知识呢！其中最主要的是杠杆原理和压强原理。许多剪刀都是手柄长于剪嘴，为什么要这样设计呢？根据杠杆原理：动力臂与动力的积等于阻力臂和阻力的积。我们发现手柄长的设计可以让人省劲。剪嘴长于手 Scissors are commonly used tools in our daily life, but you should not underestimate it. It can contain a wealth of physical knowledge! The most important one is the lever principle and pressure principle. Many scissors have handles longer than the shears. Why do you design it this way? According to the principle of leverage: The product of power arm and power is equal to the product of resistance arm and resistance. We found that the long handle design can make people save money. Cutting mouth longer than hand