Engineering Mechanics: Unit IV: Friction
Rolling Friction (Rolling Resistance)
When a wheel rests on ground, both the wheel and the ground deform due to weight of the wheel as shown in Fig 8.8.1 (a).
Rolling Friction (Rolling Resistance) • When a wheel rests on ground, both the wheel and the ground deform due to weight of the wheel as shown in Fig 8.8.1 (a). • To move the wheel at constant speed a horizontal force P is required to be applied at the axle as shown in Fig. 8.8.1 (b). • The resultant R of all forces exerted by ground on the wheel is experimentally found to be slightly in front of line of action of weight W. • To roll the wheel at constant speed, the moment of W about A has to be balanced by moment of P about A. ⸫ Wb = Pr • The length b is known as the coefficient of rolling resistance. A larger value of b makes P larger which indicates a larger effort to keep the wheel moving.
Engineering Mechanics: Unit IV: Friction : Tag: : - Rolling Friction (Rolling Resistance)
Engineering Mechanics: Unit IV: Friction
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Engineering Mechanics
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