WhatAreForces
日期：2011-09-20 09:27:00
来源：作文地带
好评：优秀英语作文
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...
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Displacement
日期：2011-09-20 09:21:00
来源：作文地带
好评：优秀英语作文
作文地带导读：Displacement is a vector quantity, commonly denoted by the vector s, that reflects an object’s change in spatial position. The displacement of an object that moves……...
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