On what factors does rolling friction depend ?write an expression for rolling friction . don't provide links .
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If you would have a rigid wheel and surface rolling without slip, then you would have no have a line contact between the wheel and the surface parallel to the axis of the wheel, which has zero surface area. This would not yield no rolling friction forces.
In the real world nothing is completely rigid and would deform due to stresses. These deformations will lead to resistance against rolling. One example formula which can be used to approximate rolling resistance is,
Fr=Nbr,Fr=Nbr,
where FrFr is the magnitude of the force of the rolling resistance, NN the normal force between the wheel and the surface, bb the rolling resistance coefficient and rr the radius of the wheel. One way of intuitively understanding this equation is that the smaller the radius of the wheel, the "sharper" it is thus it would cause a larger/deeper deformation for the same normal force.
In the real world nothing is completely rigid and would deform due to stresses. These deformations will lead to resistance against rolling. One example formula which can be used to approximate rolling resistance is,
Fr=Nbr,Fr=Nbr,
where FrFr is the magnitude of the force of the rolling resistance, NN the normal force between the wheel and the surface, bb the rolling resistance coefficient and rr the radius of the wheel. One way of intuitively understanding this equation is that the smaller the radius of the wheel, the "sharper" it is thus it would cause a larger/deeper deformation for the same normal force.
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