Agate is good protective energy stone, especially for children, and is very calming and soothing. It also can help strengthen the body's connection to the earth.
The friction factor, f, is a dimensionless factor that depends primarily on the velocity u, diameter D, density Ï, and viscosity Î·. It is also a function of wall roughness which depends on the size Îµ, spacing Îµ' and shape of the roughness elements characterized by Îµ''.
It is obviously a ratio of two forces and hence it has no dimensions. If the friction is static, then the coefficient of friction is called as âcoefficient of static frictionâ and denoted as $\mu_{s}$ and for a sliding friction the same constant is called âcoefficient of sliding frictionâ and denoted as $\mu_{k}$. The subscript âkâ is used to mean âkineticâ.