So I was thinking of brakes in a car the other day. When brakes are applied, the forward force is converted to heat in the brake disks. When brakes are cool (at the beginning) they have the ability to absorb a lot of heat and have more braking power. But as the brakes heat up, their ability to absorb more heat should decrease and in turn the braking force also decreases.
So, does this mean that the coefficient of friction decreases with temperature? If so, how does this work microscopically? Normally the coefficient of friction is a measure of how smooth or rough the two surfaces are, how would heat factor in?