Quote:
Originally Posted by Spaceywilly
Vertical load refers to the load pressing the tire into the pavement (downforce). Cornering load or acceleration/deceleration load is in the plane orthogonal to the downforce and attempts to break the tire free from the pavement. At higher vertical loads, it will take more cornering load to break the tire free. It is not because of increased cf but because of increased weight on the tire. The cf stays the same but as mentioned in carbon's post the force generated by the friction against the pavement increases. As cornering load increases, this friction begins to break away in a manner that is describes by the curves in your book.
Think about taking your hand and trying to move it across a table. If you lightly press your hand against the table it moves easily. If you put a book on top of your hand it is hard to move. The cf between your hand and the table doesn't change but there is now more force required to break the friction between your hand and the table.
|
That's right. There is also the matter of dynamic loading of the tires as the body of the car moves about the suspension system during maneuvers, but you hit the nail on the head. the coefficient of friction does not change, just the loading on the friction point.