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''.
May 1, 2014. Friction is due to the weight of the object and the coefficient of friction. The coefficient is a number that tells you how much friction you would expect between pairs of surfaces. Force friction= weight x coefficient of friction. So as the weight increases so does the amount of friction. Note on coefficients of friction: Sand paper may have a coefficient of 0.78 (the closer to 1, the more friction you will have), and a piece of ice sliding across a sheet of ice may have a coefficient of 0.02, meaning almost no friction.