Well, it would be the force of friction.

应该是摩擦力。

8m is the force of friction.

8m是摩擦力。

So we would have a force of friction acting upwards.

所以应该有一个向上的摩擦力 对吧？

This is the force of friction or you can call it air resistance.

现在考虑更多的例子。

But then there's a force of friction between the rock and the ground that is going 2...

现在考虑更多的例子。

This right over here is the force of friction.

这一节和上一节的差异在于 上次摩擦力是静态的。

So that right over there is the force of friction. It's going against that guy's pushing.

现在考虑更多的例子。

And as you can imagine, this is the force of friction.

这个力是摩擦力。

There is not just the force of me pushing. There is also the force of friction.

实际上, 物体所受的力不单只是推力, 还有摩擦力。

If my force of pushing is less than the force of friction, then the TV set will to decelerate.

如果推力小於摩擦力, 则电视会慢下来。

If my force of pushing is larger than the force of friction, then my TV set will accelerate.

如果推力大於摩擦力, 电视将会加速运动.

I could have if I had a force of friction.

如果我有摩擦力， 我就能做到。

This guy's pushing harder with 3 N, but the force of friction is now 2 N to the left.

现在考虑更多的例子。

I'm gonna have a force of friction that I have to subtract.

我将有一个必须减去的摩擦力。

29.4 Newtons minus the force of friction it's given by. So there's a formula for force of friction.

29.4 牛顿减去它给出的摩擦力。所以有一个摩擦力的公式。

The force of friction is always mu K FN.

摩擦力始终为 mu K FN。

So minus mu K so the force of friction--- I'll just put force of friction.

所以减去 mu K 所以摩擦力 --- 我只输入摩擦力。

The force of friction pushes hard against your socks as you try to slide them across the carpet.

当您试图将袜子滑过地毯时，摩擦力会强烈地挤压您的袜子。

It's only the normal force on this five kilogram mass that's contributing to this force of friction here.

只有作用在这个 5 千克重物上的法向力才对此处的摩擦力产生影响。

And the force of friction  does not depend on the size of the surface area of contact between the two surfaces.

并且摩擦力不取决于两个表面之间接触表面积的大小。