|
Stick–slip Phenomenon
The stick–slip phenomenon, also known as the slip–stick phenomenon or simply stick–slip, is a type of motion exhibited by objects in contact sliding over one another. The motion of these objects is usually not perfectly smooth, but rather irregular, with brief accelerations (slips) interrupted by stops (sticks). Stick–slip motion is normally connected to friction, and may generate vibration (noise) or be associated with mechanical wear of the moving objects, and is thus often undesirable in mechanical devices. On the other hand, stick–slip motion can be useful in some situations, such as the movement of a bow across a string to create musical tones in a bowed string instrument. Details With stick–slip there is typically a jagged type of behavior for the friction force as a function of time as illustrated in the static kinetic friction figure. Initially there is relatively little movement and the force climbs until it reaches some critical value which is set by the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tryouts For Army's Best Basketball Players DVIDS721367
"The Tryouts" is a science fiction short story by American writer Barry B. Longyear. It was first published in ''Isaac Asimov's Science Fiction Magazine'' in 1978. Plot summary On Momus, a primitive planet with no mass communications technology, news and information is disseminated by itinerant members of the Newstellers Guild. One night, a group of travellers sit around a campfire and a Master Newsteller, Boosthit, accompanied by his apprentice, tells a story. The tale he spins tells of Lord Ashley Allenby, an ambassador from a neighbouring quadrant of inhabited planets, whose mission is to warn the planetary government of an impending invasion. Allenby's ship is damaged and he has to put down his lifeboat (rescue), lifeboat in a desert, not knowing his location. He learns from a traveller that all information, even directions to the nearest town, has a value and must be bargained for. In the town of Tarzak, he also learns that the planet has no capital and no central government ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
