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In classical mechanics, a reactive centrifugal force forms part of an action–reaction pair with a centripetal force. In accordance with Newton's first law of motion, an object moves in a straight line in the absence of any external forces acting on the object. A curved path may however ensue when a physical acts on it; this force is often called a centripetal force, as it is directed toward the center of curvature of the path. Then in accordance with Newton's third law of motion, there will also be an equal and opposite force exerted by the object on some other object,〔 〕〔 〕 such as a constraint that forces the path to be curved, and this reaction force, the subject of this article, is sometimes called a reactive centrifugal force, as it is directed in the opposite direction of the centripetal force. Unlike the inertial force or fictitious force known as centrifugal force, which always exists in addition to the reactive force in the rotating frame of reference, the reactive force is a real Newtonian force that is observed in any reference frame. The two forces will only have the same magnitude in the special cases where circular motion arises and where the axis of rotation is the origin of the rotating frame of reference. It is the reactive force that is the subject of this article.〔 〕〔 〕〔 〕〔 〕 ==Difference from centrifugal pseudoforce== Any force directed away from a center can be called "centrifugal". ''Centrifugal'' simply means "directed outward from the center".〔http://dictionary.reference.com/browse/centrifugal〕 Similarly, ''centripetal'' means "directed toward the center".〔http://dictionary.reference.com/browse/centripetal〕 The "reactive centrifugal force" discussed in this article is not the same thing as the centrifugal pseudoforce, which is usually what's meant by the term "centrifugal force". 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Reactive centrifugal force」の詳細全文を読む スポンサード リンク
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