A constant representing this phenomenon equals 64 over the Reynolds number for laminar flow. The arctangent of a constant associated with this phenomenon gives the angle of repose. This phenomenon results in the only net torque through the center of mass on a ball rolling down a hill. It is responsible for the buildup of static charges in the triboelectric effect. Most damping is caused by a form of this phenomenon. Its magnitude is proportional 
A constant representing this phenomenon equals 64 over the Reynolds number for laminar flow. The arctangent of a constant associated with this phenomenon gives the angle of repose. This phenomenon results in the only net torque through the center of mass on a ball rolling down a hill. It is responsible for the buildup of static charges in the triboelectric effect. Most damping is caused by a form of this phenomenon. Its magnitude is proportional to the normal force with a coefficient symbolized mu. It comes in static and kinetic forms, and its magnitude can be reduced with lubricants. For 10 points, name this force which dissipates heat when two objects are rubbed against each other.
A constant representing this phenomenon equals 64 over the Reynolds number for laminar flow.
friction [prompt on "drag"; prompt on "air resistance"]