maybe keeping μk at some value,

控制 μk 为某个定值
vary the angles so that this number times that can beat this.

改变倾角使这个乘积大于它
Then what happens?

然后会发生什么呢
Yes?

请说
That is the point.

正是如此
Okay? Let me repeat his answer; that's the correct answer.

我再来重复下他的回答他说的没错
You're right about kinetic being less than static and so on.

你说动摩擦系数要小于静摩擦系数等是没错
But you can always imagine keeping that number constant

但你总能想象保持这个数值不变
but changing the angle to the cosine gets bigger and sine gets smaller.

然后改变角度使得余弦值增大正弦值减小
At some point, you agree,

那么在某个值的时候
cosine will beat the sine,

余弦值会大于正弦值
because sine is going towards 0 and cosine's going towards 1.

因为正弦值趋于 0 时余弦值趋于 1