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  • 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...

    are what object force Forces

  • 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……...

    meters Displacement Eva path object

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