'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 一、参照物 1、定义:为研究物体的运动假定不动的物体叫做参照物。 2、任何物体都可...
'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 力的作用效果 1. 力可以改变物体的形状,使物体发生形变。 2. 力可以改变物体的运动状...
'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 常见的物理量 1.质量: 中学生:50kg;一个鸡蛋:50g;一个硬币5g; 一个苹果:200g;物理课本...
'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 机械效率 1、有用功和额外功 ①有用功定义:对物体所做的功是有用的,有用功是必须...
'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 有用功和额外功 ①有用功定义:对物体所做的功是有用的,有用功是必须要做的功。...
'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 浮力的应用 1、物体的浮沉条件: 浸在液体中的物体,当它所受的浮力大于重力时,物...
'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 误差 ⑴定义:测量值与真实值之间的差异叫误差。 ⑵产生的原因:与测量工具有关,与...
'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 定义:物体在两个力的作用下能保持静止或匀速直线运动状态,则称这两个力是一对平...
'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 力的合成:已知几个力的大小和方向,求合力的大小和方向叫做力的合成。 1)当二力方...
'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 重力.压力的画法:...