Friction motor - Wikipedia

Sleeve valve - Wikipedia

Solar Energy Motor / 12 Sided Mendocino - Motor

Electric motor - Wikipedia

fussing with stuff: 07/03/06

Energies, Free Full-Text

Bearing (mechanical) - Wikipedia

AC motor - Wikipedia

Centrifugal clutch - Wikipedia

Friction stud welding - Wikipedia

Basics of rheology

Friction drive - Wikipedia

Commutator (electric) - Wikipedia

Flywheel energy storage - Wikipedia

Motor oil - Wikipedia