friction apparatus
31Tribology — is the science and engineering of interacting surfaces in relative motion. It includes the study and application of the principles of friction, lubrication and wear. Tribology is a branch of mechanical engineering. Contents 1 Fundamentals 1.1… …
32Timeline of diving technology — This is a timeline of underwater technology. The entries marked ## are about decompression tables.[1] Contents 1 Pre industrial 2 19th century 2.1 Rebreathers appear …
33Disc brake — Close up of a disc brake on a car On automobiles, disc brakes are often located with …
34Conservation of energy — This article is about the law of conservation of GPE in physics. For sustainable energy resources, see Energy conservation. Prof. Walter Lewin demonstrates the conservation of mechanical energy, touching a wrecking ball with his jaw. (MIT Course… …
35Oil-drop experiment — The purpose of Robert Millikan and Harvey Fletcher s oil drop experiment (1909) was to measure the electric charge of the electron. They did this by carefully balancing the gravitational and electric forces on tiny charged droplets of oil… …
36Magnetic bearing — A magnetic bearing A magnetic bearing is a bearing which supports a load using magnetic levitation. Magnetic bearings support moving machinery without physical contact, for example, they can levitate a rotating shaft and permit relative motion… …
37Glossary of firefighting equipment — Note: This list is incomplete. You can help Wikipedia by [http://en.wikipedia.org/w/index.php?title=Glossary of firefighting equipment action=edit adding to it] . 0 9 * 1 3/4 inch hose: see attack hose * 2 1/2 inch hose: see attack hose , supply… …
38History of submarines — The history of submarines covers the historical chronology and facts related to submarines , manned autonomous boats that operate underwater. It includes the history of submersibles , which were designed primarily to operate on the surface, and… …
39railroad — /rayl rohd /, n. 1. a permanent road laid with rails, commonly in one or more pairs of continuous lines forming a track or tracks, on which locomotives and cars are run for the transportation of passengers, freight, and mail. 2. an entire system… …
40motion-picture technology — Introduction the means for the production and showing of motion pictures. It includes not only the motion picture camera and projector but also such technologies as those involved in recording sound, in editing both picture and sound, in… …
