How does a motorbike run without falling off?
Is gravity is helping to ride the motorbike or a bicycle. Then how gravity works on the motorbike?
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Your question is sort of worded poorly. But it feels to me like you wanna know the minimum velocity required to successfully send a motorbike through a vertical circle without falling off.
The minimum velocity at the very top would have no other force working towards the center then the weight of the motorbike.
Therefore, (MV^2/r) = mg
m cancels out
v^2/r= g
v^2= rg
sqrt(rg)= velocity critical.
Taking the square root of the radius times the acceleration due to gravity would give you the minimum speed required.