Yes? There's friction.

请讲有摩擦力
There's friction because we know if you pull a real spring

有摩擦是因为我们知道如果拉一个真实的弹簧
it's not going to oscillate forever.

它并不会永远地来回振动
It's going to slowly stop shaking and pretty much come to rest.

它会慢慢停止振动最后完全静止
That just means-- Who do you want to blame for this equation?

这意味着你觉得这是谁的错
Do we conclude now there's something wrong with Newton's Laws?

我们现在能认定牛顿定律有错误吗
Or what's the problem?

那么问题出在哪里
Pardon me?

什么
The fault is not with the k.

k 没有问题
Yes?

请讲
That is correct.

正确
So, we will say we have missed something.

我们遗漏了一些东西