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''.
Two surfaces meeting with motion between them. Friction is caused when the interlocking of 2 irregular â¦ surfaces comes in contact with. Friction is a force that slows things down or tries to stop an object moving. Friction causes grip and heat for example the brakes on your bike will be hot after they have slowed down the moving wheel. Without friction you feet would slip on the ground and the tires would slip and flip on the roads, and they both rely on friction to stay put.