加速度和速度都是矢量。
我可以测量它了，因为我把它拉到了一厘米，我发现它对一个已知质量施加的加速度。
I can measure that, because I pull it by one centimeter and I find the acceleration it exerts on a known mass.
不要把沿圆周的切向加速度与向心加速度混淆。
Do not confuse ever the tangential acceleration, which is along the circumference, with centripetal acceleration.
在同一时期内，X 射线光源亮度的增加速度要快得多。
The increase in brightness of the x-ray sources over the same period has occurred far faster.
意识到了这种程度的恶性通货膨胀和面值的增加速度没法维持下去，匈牙利平格就被新货币福林所取代。
Realizing that this type of hyperinflation and denomination increase was not sustainable, the Pengo was replaced by the Forint.
目前为止，是关于速率，平均速度和加速度。
All right, so far, about speeds and average velocities and accelerations.
前提要求就是，具有向心加速度，朝这个方向，向心力的作用。
There is a requirement that there is a centripetal acceleration, which is in this direction, a centripetal.
现在我将和你们一起，计算圆柱会获得的加速度。
Now I would like to calculate with you the acceleration that a cylinder would obtain.
这也就是瞬时加速度。
仅为重力加速度的,五分之一。
判断落地时安全与否的最佳方法就是计算落地时的加速度。
The best way to estimate the safety of a landing is to look at the acceleration.
我们还学过加速度，也就是速度向量的导数。
And, we've also learned about acceleration, which is the derivative of velocity.
随着它的旋转，就产生了加速度。
角加速度等于，角速度的导数。
And angular acceleration is the derivative of angular velocity.
乘客可接受的加速度和基于整车性能预期的制动策略。
Acceptable occupant accelerations and restraint strategies based on expected vehicle performance.
它还是得碎,因为加速度,实在太大了。
Something breaks because the magnitude of acceleration becomes too high.
就加速度而言这意味着什么呢？
这节课主要讨论速度和加速度。
一个很小的加速度。
如果存在一个力矩，就会产生一个，角加速度。
And if there is a torque, there's going to be an angular acceleration.
那加速度就是。
这样我们，就能求出向心加速度。
And we can calculate now what the centripetal acceleration is.
善用加速度可以让你成为赢家，即使你的对手远比你跑得快。
Acceleration can make you a winner, even if your opponent can ultimately run faster than you.
这意味着加速度与位矢平行。
So, that means the acceleration is parallel to the position.
加速度说道：，我不让你向下了。
如果加速度减小，振荡周期变大。
If the acceleration goes down, the period of oscillation goes up.
大致是重力加速度的40倍。
我们在上节课讲了推力和拉力，可产生加速度。
Last time we discussed that an acceleration is caused by a push or by a pull.
这等于角加速度。
这等于角加速度。
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