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''.
f = ÂµR f is the frictional force that created when two surfaces move across each other. Âµ is the coefficient of friction, which depends on the contacting materials. R â¦ is the normal force exerted by one surface to another. Therefore, greater the normal force, greater the frictional force is. In other words, frictional force is directly proportional to the normal reaction.