You can also discuss circular motion with your class, explaining why the ball doesn't fall off the track at the top of the loop.
你也可在班上讨论圆周运动，为何球不会在圆周的顶端掉下。
You can also discuss circular motion with your class, explaining why the ball doesn't fall off the track at the top of the loop.
你也可在班上讨论圆周运动，为何球不会在圆周的顶端掉下。
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