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 F r = c W (1)where Fr = rolling friction (N, lbf)c = rolling coefficientW = 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
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 F r = 0
03 (1500 kg) (9
