What creates the reaction force in a vertical circle?

AI Thread Summary
The reaction force in a vertical circle, such as a cyclist going upside down, is produced by the combination of gravitational force and the force exerted by the track. Gravity acts downward while the centripetal force, necessary for circular motion, is directed toward the center of the circle. This centripetal force is calculated using the formula mv²/r, where m is mass, v is tangential speed, and r is the radius of the circular path. The forces acting on the bike ensure it maintains its circular trajectory. Understanding these forces is crucial for analyzing motion in vertical loops.
daveyavey
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Hey, Simply I want to figure out what produces the reaction force, in this picture i drew, a reaction force appears directing in the same direction as the weight force, any ideas why? Sorry for the bad drawing

The example shows a cyclist going around a loop (upsidedown)
 

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The track exerts a force on the bike.
 
Doc Al said:
The track exerts a force on the bike.

Oh... its that simple... sorry haha
 
daveyavey said:
Oh... its that simple... sorry haha
Yep. The combination of the force of the track and the weight of the bike create the centripetal force that keeps it going in a circle.
 

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