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''.
Best Answer: There's a lot of factors. Friction force is equal to mu*N, where mu is the coefficient of friction between the two objects, and N is the normal force, or how hard the objects are pressed together. Three of the biggest factors affecting friction are: 1) The stickiness of the surfaces to one another. This affects the coefficient of friction. 2) The force between the objects; this is the normal force. 3) Whether the objects are already sliding past one another. This also affect the coefficient of friction (static friction vs kinetic friction).