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''.
1 Friction-Friction is a force caused when one object rubs against another. 2  It works in the opposite direction of the main force. 3  Gravity-Gravity is a force caused by a large body, such as the Earth. 4  Gravity pulls objects toward the Earth with an acceleration of g which equals 9.8 m/s 2.