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所谓的“供需”关系是指做圆周运动的物体所需要的向心力F需,与外界所能提供的向心力的关系:a.若F需=F供,物体将做稳定的圆周运动;b.若F需>F供,物体将向远离圆心的方向运动;c.若F需F for the object to move away from the center of the circle; c. If F needs to be provided, the object will move in the direction of the center of the circle. Example analysis: