向心运动：指物体做圆周运动时，提供的向心力大于所需要的向心力时物体所做靠近圆心的运动。
原创：等速向心运动中膝关节屈伸肌群的sEMG研究 - 医学论文发表 - xzbu.com 中国论文网 关键词：等速；向心运动；膝关节；sEMG [gap=318]Key words: isokinetic；concentric exercise；knee；sEMG
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先前在讲行星时,我们讨论过这个，我们讨论的是,匀速圆周运动，而且我们评估了,向心加速度。
We have discussed that earlier when we dealt with the planets, and we dealt with uniform circular motions, and we evaluated the centripetal acceleration.
只要它们以向心方向保持足够迅速的移动，它们就拥有活的形体，但是随着它们倒转，向外以离心方向运动，它们就丧失了形体。
As long as they move fast enough in a centripetal direction, they have living bodies, but as they reverse to the outward, centrifugal direction, they lose their bodies.
详细讨论了当向心力突然增大后，原来作匀速圆周运动的小球其运动轨迹的变化情况，证明了小球将作螺线运动。
A small ball is making circular motion at the uniform velocity, the centripetal force has suddenly increased, it is proved that the small ball will generally make a spiral motion.
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