Statics › Section I · Friction › Topic I.7
Rotating discs
When a flat face spins against another, friction acts over the whole contact area and resists the rotation with a moment. Adding up that moment is a short integral, and its result sizes thrust bearings, clutches and the disc brakes on a car.
In this topic
- Friction on a turning face
- Why the outer rim matters more
- Setting up the integral
- The collar bearing formula
- Solid faces: end bearings
- Worked example: a collar bearing
- Disc brakes
- Worked example: a car's disc brake
- Beyond basic statics: uniform wear
- Common mistakes to avoid
- Key takeaways
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