如何分辨受力物体与施力物体？ 如何区分施力物体和受力物体
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重力是由于物体具有质量而在物体间产生的万有引力的一个分力，如果考虑一个物体，比如足球，它的重力是由于地球的引力而造成的，施力物体是地球，足球是受力物体；如果考虑的是地球，那么施力的是足球，受力的地球
受力和施力是相对的而言的,没有唯一的.
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