Module 1:Vehicle DynamicsPart 1Mechanics of Machines IIPrepared by: Mr. KD. Mosimanyane
TractiveforceTractive force or tractive effort or traction is the force applied between the tire and road surface to move acar or any vehicle for that matter.The maximum permissible tractionforcethat can be applied to the wheels is governed by two things: theweight of the vehicle and the adhesion coefficient between the tire and the road surface.More the weight and the adhesioncoefficientmore amount of tractive force can be applied to the wheelswithout causing slips between the tires and road.
Vehicle going up a slopeUp a slopeT = Force required to overcome tractive resistanceWsinϴ = Force required to overcome gravityma = Force required to cause accelerationTotal force applied = T + ma + WsinϴTotal force applied = 0T + ma + Wsinϴ = 0W= mg = m x 9.81 (m is mass of vehicle)
Vehicle going down a slopeDown a slopeT = Force required to overcome tractive resistanceWsinϴ = Force required to overcome gravity