1、The force resisting the motion when a body rolls on a surface is called the rolling resistance or rolling 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)
Roll
2、ing 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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