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.
这种车的杀手锏在于其加速度。
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.
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。
这样我们，就能求出向心加速度。
And we can calculate now what the centripetal acceleration is.
如果加速度减小，振荡周期变大。
If the acceleration goes down, the period of oscillation goes up.
那平均加速度到底是多少呢？
意味着有一个巨大的加速度。
这是位置，这是速度,然后是加速度。
This is the position, this is its velocity and this is its acceleration.
这意味着加速度与位矢平行。
So, that means the acceleration is parallel to the position.
大致是重力加速度的40倍。
我们已经推导出了加速度,是这个方向。
We know that the acceleration is in this direction. We derived that.
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.
其大小,那么这个整体的加速度是多少？
This is the force-- and the magnitude What is the acceleration of this system?
然后将当前的基数设为现有的加速度级别。
Then set the current base to the existing level of acceleration.
这一情况下，点击前后的加速度是不同的。
In this case, the acceleration of the bird is different after the tap.
也不知道加速度是多少。
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.
这也就是瞬时加速度。
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.
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.
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