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1·Do not confuse ever the tangential acceleration, which is along the circumference, with centripetal acceleration.

不要把沿圆周的切向加速度与向心加速度混淆。

2·We call it centripetal acceleration.

我们称之为“向心加速度

3·It is called the centripetal acceleration.

这叫做向心加速度。

4·And we can calculate now what the centripetal acceleration is.

这样我们，就能求出向心加速度。

5·But there is nothing to provide that centripetal acceleration.

但这里却没有力，能提供向心加速度。

6·100 times closer has a 10,000 times larger centripetal acceleration.

距离近一百倍，而向心加速度大一万倍。

7·Notice that the acceleration, the centripetal acceleration is linear in r.

在此注意，向心加速度与r是成正比的。

8·If the centripetal acceleration is larger than 10 then, of course, the string will be tight.

若向心加速度0,则此时绳子会绷紧。

9·So what I get now is must be m times the centripetal acceleration Hey! That looks very familiar.

则现在,必然等于m乘以向心加速度,嘿，看起来太眼熟了。

10·r and therefore, you require centripetal acceleration towards the center-- that is non-negotiable.

所以你需要，This，v，equals，omega，rv=ω,向心加速度,依然毫无商量余地。