在物理学中,将一根在力的作用下绕一固定点转动的硬棒称做杠杆.为了了解杠杆的应用,我们先来了解几个与杠杆有关的概念.以图1甲中钢丝钳为例,其中A为剪钢丝处,B为手的用力点,O为转动轴(支点),图乙为单侧钳柄及相连部分示意图,图丙中画出剪钢丝时的动力F1、阻力F2、动力臂l1、阻力臂l2.其中: In physics, a hard rod that turns around a fixed point under force is called a lever. To understand the application of a lever, let’s first understand a few lever-related concepts. As an example, where A is the shear wire, B is the hand point of force, O is the axis of rotation (fulcrum), Figure B is the unilateral clamp handle and the connected part of the schematic diagram, drawing C draws the power when cutting the wire F1, resistance F2, power arm l1, resistance arm l2. Where: