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杠杆类作图是初中物理力学作图题中的重点,也是各类考试的热点,还是学习中的一个难点.为帮助同学们掌握这部分作图的要领,现对杠杆类作图进行分类讲解.一、怎样作杠杆的力臂要想正确作出杠杆的力臂,首先必须弄明白什么是力臂.力臂是从支点到力的作用线的距离,有动力臂和阻力臂两种.动力臂是从支点到动力作用线的距离,阻力臂是从支点到阻力作用线的距离.作杠杆的力臂可分为四步.(1)找支点:支点是杠杆绕着转动的固定点,常用
Leveraged drawing is the focus of junior high school physics and mechanics drawing the problem, but also a hot spot for all kinds of exams, or a difficulty in learning.In order to help students master the essentials of this part of the mapping, First, how to leverage the lever To make the right lever lever, we must first understand what is the force arm. Lever arm is the distance from the fulcrum to the line of force, power arm and resistance arm two. Arm is the distance from the fulcrum to the line of action, the resistance arm is the distance from the fulcrum to the line of resistance effect.Left arm as a lever can be divided into four steps: (1) Find the fulcrum: The fulcrum is the fixed point of the lever around the rotation, Commonly used