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 a force that resists motion. It occurs when one object is in contact with another object. When two surfaces are pressed together, the molecules of these surfaces come in contact and experience attractive forces between one another.t also causes objects to heat up or make a sound. When you rub your hands together, for example, they begin to feel warmer because friction is heating them up. In addition, rubbing your hands together makes a sound.