Braking Fundamentals
Braking Fundamentals Energy of Motion. Kinetic energy is the force that keeps the vehicle moving. This energy is provided by the engine in order to accelerate the vehicle from a standstill to desired speed. Kinetic energy is dissipated as heat by the brakes during application of breaks (Fig. 28.1). The kinetic energy of a vehicle during braking is given by Thus, the kinetic energy doubles as the weight doubles, but it increases four times as speed doubles. Fig. 28.1. Illustration of braking. Coefficient of Friction. Frictional force opposes the motion of the vehicle. Consequently it consumes power and produces heat. Frictional force occurs between the sliding tire and the road surface when wheel rotation is locked by brakes. The ability of a vehicle to stop depends on the coefficient of friction between the contacting surfaces. Maximum useable coefficient of friction occurs between the tyre and road surface. Passenger car brakes have coefficient of friction 0.3 to 0.5. The amount of en