Just a quick question everyone. It's annoying me quite a lot as I used to know it, but I've not done physics for over a year and I'm getting quite rusty. My question concerns a car under braking, and how the its velocity is reduced. As I understand it, the frictional forces generated by the brakes producing a torque opposite to that of the rotation is unable to slow the car as it is an internal force, and only external forces can reduce its speed. Right? In which case how does the car actually slow down? I know it's something to do with the road pushing back on the car, but I'm so rusty I can't remember it. Thanks in advance.