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分析物体做圆周运动时,首先要让学生弄明白两个问题:一是物体做圆周运动需要的向心力,二是谁提供它需要的向心力.只有当提供的力能满足它需要的向心力时,即“供”与“需”平衡时,物体才能在稳定的轨道上做圆周运动,否则物体将发生变轨现象——物体远离圆心或靠近圆心.对于人造卫星而言,在某一轨道上以某一速度运动,万有引力与向心力相等时,
When analyzing an object for circular motion, it is first necessary for the student to understand two problems: one is the centripetal force required for the object to make a circular motion, and the other is who provides the centripetal force it needs. Only when the provided force can satisfy the centripetal force it needs, ie When “for” and “to be” balance, the object can do circular motion on a stable orbit, otherwise the object will change orbit - the object is far away from the center or close to the center of the circle. For satellites, at a certain When the orbit moves at a certain speed and the gravitational force is equal to the centripetal force,