WhatAreForces
2011-09-20 17:27:00 来源：网络资源 双击单词自动翻译
作文地带导读：Whenever we lift something, push something, or otherwise manipulate an object, we are exerting a force. A force is defined very practically as a push or a pull—essentially it’s what makes things move. A force is a vector qua
Because force is a vector quantity, it follows the rules of vector addition. If your evil roommate comes and pushes the box in the opposite direction with exactly the same magnitude of force (force –F), the net force on the box is zero
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