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Physics
Classical Physics
Mechanics
Friction of a Wheel on the Axle?
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[QUOTE="CWatters, post: 6031221, member: 423469"] I'm not really sure you are asking the right questions. What are you trying to understand/design? Wheels roll so the power required to move a cart depends mainly on the rolling resistance between wheel and road not the friction between wheel and road. There are several ways to model friction but the simple model is independent of contact area because the larger the area the lower the pressure between the surfaces. Smaller diameter plan bearings move the friction nearer to the axis of rotation so the torque and power is reduced...but ball bearings are better. Static friction in a bearing is only significant when the cart starts to move. Once moving there is no static friction only kinetic friction. Kinetic friction in simple models is independent of velocity but that's not always true. [/QUOTE]
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Physics
Classical Physics
Mechanics
Friction of a Wheel on the Axle?
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