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Rolling Resistance

Rolling friction and rolling resistance

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The force resisting the motion when a body rolls on a surface is called the rolling resistance or rolling friction.

rolling resistance friction

The rolling resistance can be expressed as

Fr = c W         (1)

where

Fr = rolling friction (N, lbf)

c = rolling coefficient

W = normal force or weight of body (N, lbf)

Rolling Friction Coefficients

Some typical rolling coefficients:

Rolling Friction  
0.001 - 0.0025 steel wheels on steel rails
0.0015 - 0.0025 low resistance tubeless tires
0.005 tram rails
0.006 - 0.01 truck tire on asphalt
0.01 - 0.015 ordinary car tires on concrete
0.03 car tires on tar or asphalt
0.04 - 0.08 car tire on solid sand
0.2 - 0.4 car tire on loose sand

Example - Normal car on asphalt

The rolling resistance of a normal car 1500 kg on asphalt with rolling friction can be estimated like

Fr = 0.03 (1500 kg) (9.81 m/s2)

= 441 N

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Related Topics

  • Dynamics - Dynamics Motion - velocity and acceleration
  • Mechanics - Kinematics, forces, vectors, motion, momentum, energy and the dynamics of objects

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