How Does a Bicycle's Friction Drive Work?

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SUMMARY

The discussion centers on the mechanics of a bicycle's friction drive system, specifically how a roller interacts with the bicycle tire to generate motion. The roller, spinning counterclockwise, applies an internal force that causes the tire to rotate. This rotation results in a backward force exerted by the tire onto the pavement, which in turn generates a forward force from the pavement that propels the bicycle forward. The key takeaway is that the forward motion of the motorized bicycle is primarily due to the pavement's reaction force.

PREREQUISITES
  • Understanding of basic physics principles, particularly Newton's Third Law of Motion.
  • Familiarity with bicycle mechanics, including tire and roller interactions.
  • Knowledge of friction and its role in motion.
  • Basic comprehension of motorized bicycle systems.
NEXT STEPS
  • Research the principles of Newton's Third Law of Motion in depth.
  • Explore the mechanics of friction in various materials, particularly rubber on pavement.
  • Study the design and function of friction drive systems in motorized bicycles.
  • Investigate the impact of tire pressure and surface texture on friction and performance.
USEFUL FOR

Engineers, bicycle enthusiasts, and anyone interested in the mechanics of motorized bicycles and friction drive systems.

twistedmind
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Can anybody help me with these forces, I appreciate the effort.
The roller shown sitting on top of the circle which is the bictcle tire is spinning counterclockwise imparting a tangential force on the bicycle wheel.
Is the roller creating the force to drive the wheel forward, or is the entire assembly moving the bicycle forward?
whas that question too long?
thanks
 

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Physics news on Phys.org
Assuming that the roller, assembly, and bicycle tire are all connected as a unit, the roller is applying an "internal" (within the bicycle system) force to cause the tire to rotate. At the contact patch between tire and pavement, the tire exerts a backwards force onto the pavement, coexistant with pavement exerting a forwards force onto the tire.

It's the pavement's forward force that propels the motorized bicycle forwards.
 

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