Two of the assumptions in Brenoulli's Theorem say
1. The fluid should be non-viscous
2. The velocity of fluid should be less than its critical velocity
Now how can these two co-exist. We know that
Vc = (N.n)/(D.p)
Vc= Critical Velocity
N= Raynolds No.
n= viscosity coef.
D= Dia of...
In solids there are crests and troughs. In highly polished surfaces there are molecular forces. But what creates friction during rolling where there is only line contact (in case of cylinder) or point contact (inn case of a ring)?
I read somewhere that when an object is rolling it forms a...