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''.
Friction is typically characterized by a coefficient of friction which is the ratio of the frictional resistance force to the normal force which presses the surfaces together. In this case the normal force is the weight of the block.Typically there is a significant difference between the coefficients of static friction and kinetic friction. Note that the static friction coefficient does. characterize static friction in general, but represents the conditions at the threshold of motion.friction = Î¼N Î¼ = coefficient of frictionÎ¼k = coefficient of kinetic frictionÎ¼s = coefficient of static friction Standard model of friction The frictional force is also presumed to be proportional to the coefficient of friction.