That's the inverse of the time period.

它是周期的倒数
So, if you pull a mass and you let it go,

如果拉动并释放这个物体
it oscillates with a frequency

它有一个振动的周期
which is connected to the force constant and the mass.

与劲度系数和物体的质量有关
If the spring is very stiff and k is very large, frequency is very high.

如果弹簧很僵硬 k 很大频率就很快
If the mass is very big and the motion is very sluggish, f is diminished.

如果质量很大运动很慢 f 就很小了
So, all that stuff comes out of the equation.

这些就是从方程得到的东西
One really remarkable part of the equation

其中一个很重要的部分是
is that you can pick any A you like.

你可以选取任何 A
Think about what that means

想想这意味着什么
What is the meaning of A? A is the amount

A 代表什么 A 就是
by which you pulled it when you let it go.

物体被释放时的位置