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''.
â¢ Factors that affect the magnitude of friction include the force pushing the surfaces together and the materials that make up the surfaces. â¢ Kinetic friction is a force that, when unbalanced, can change the velocity of a moving object. â¢ Static friction can balance other forces and can prevent changes in motion.