Hi, Just having a discussion with a friend about the contact patch of a tyre on a road and it's effect or lack of on friction. I know that contact patch has no effect on the friction as friction is to do with the pressure applied but surely having more of the surface touching the other surface you're increasing grip in some way. Lets say for example you have two identical cars in terms of weight, size, tyre size, air pressure in tyres etc but one car has 4 wheels the other 3 wheels. Which one would stop quicker at the same speed logically the 4 wheeled car with more contact area should be able to stop quicker but then in terms of physics the 3 wheeled car would stop better as there is more pressure on each of the wheel so more friction. So which is the correct answer?