frictional wear
21Rail transport — Railroad and Railway both redirect here. For other uses, see Railroad (disambiguation). Rail transport is the conveyance of passengers and goods by means of wheeled vehicles specially designed to run along railways or railroads. Rail transport is …
22Dental braces — (also known as orthodontic braces, or simply braces) are devices used in the orthodontic industry that help align and straighten teeth and help to position them with regard to a person’s bite, while also working to improve dental health. They are …
23Anchor escapement — Anchor escapement. The anchor and escape wheel of a late 19th century clock …
24Polyphenyl ether — Phenyl ether polymers are a class of polymers that contain a phenoxy and or a thiophenoxy group as the repeating group. Commercial phenyl ether polymers belong to two chemical classes: polyphenyl ethers, or PPEs, and polyphenylene oxides, or PPOs …
25Extrusion — is a process used to create objects of a fixed cross sectional profile. A material is pushed or drawn through a die of the desired cross section. The two main advantages of this process over other manufacturing processes is its ability to create… …
26Bicycle and motorcycle dynamics — A computer generated, simplified model of bike and rider demonstrating an uncontrolled right turn. An …
27Failure theory (material) — v · d · e Materials failure modes Buckling · Corro …
28watch — /woch/, v.i. 1. to be alertly on the lookout, look attentively, or observe, as to see what comes, is done, or happens: to watch while an experiment is performed. 2. to look or wait attentively and expectantly (usually fol. by for): to watch for a …
29Silver — This article is about the chemical element. For the color, see Silver (color). For other uses, see Silver (disambiguation). palladium ← silver → cadmium …
30Railgun — A railgun is a purely electrical gun that accelerates a conductive projectile along a pair of metal rails using the same principles as the homopolar motor.Railguns use two sliding or rolling contacts [http://www.youtube.com/watch?v=M0YRslyGiOI… …
