The consequences of dynamic loads when applied to static and mobile interfaces between rigid bodies, with some working clearance, are discussed. Load dynamicity in such cases is often counteracted by making use of the well-known squeeze film effect. This is autonomously achieved in hydrostatic guideways and in hydrodynamic journal bearings with a large length-to-diameter ratio, and it is shown how to also achieve in bearings with a small such ratio. The importance of radial and axial squeeze film damping the ring gear of double-helical planetary gearing is also discussed. Squeeze film dampers are presented with their different types and applications in the engine-rotor rolling bearings of turbojet and turboprop aircraft. Hydraulic torsional dampers for mechanical shaft power transmission are explained. Short-stroke linear dampers are discussed, mainly in their application in rotor hubs of helicopters. So is damping high-speed intermittent reciprocating systems. Sliding and skidding in rolling contacts is presented and a showcase is made on an old unconventional engine design that does not properly comply with the principles set forth; concealing several design pitfalls.