How does the kart move, brake, accelerate and turn? The absolute protagonists of these actions are the tyres, which transform the inputs from the engine, brakes and steering, into acceleration (and deceleration) on the track. How? By exchanging, through contact with the asphalt, so-called "tangential" forces, i.e. applied at the point of contact between the wheel and the asphalt and with a "horizontal" direction, therefore parallel to the asphalt. To understand how these forces develop, it is necessary to divide them into two types: longitudinal forces, which develop along the longitudinal axis of the wheel, and transverse forces, also called lateral forces, along the transverse axis of the wheel. The former are those that allow the kart to accelerate and brake, the latter allow you to turn left and right.