The wheel is the first and also the most important inventions of mankind. We took this invention and modified it according to our need as it is seen fit.

With each improvement, we made it the best there is and also aimed at making it easier to roll. But the inhibiting factor here is called rolling friction and that is our topic of the day.

Rolling Friction is denoted by F= μR X N, here F is rolling friction, Mu is coefficient of friction and N is the normal force. Rolling friction is so important for automobiles that it accounts to almost 4 to 8 % of the total fuel consumption. In trucks, the number is much higher at 15 to 30 %.

There are 2 major reasons behind rolling friction, they are viscoelastic forces between the tyres and the floor. The other reason is the surface roughness of the wheel and the road.

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