Tehnička mehanika 1 - usmeni deo teorijska pitanja
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University
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Hard
TECTONIKOS !
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1.
FLASHCARD QUESTION
Front
Kako se definiše rezultanta datog sistema sila. Koji su uslovi za njenu egzistenciju?
Back
Rezultanta sistema sila je jedna sila koja je ekvivalentna datom sistemu sila.
Uslov za njenu egzistenciju su da vektorksa suma sila nije nula i da rezultujući moment može da se predstavi kao moment u odnosu na osu rezultante.
2.
FLASHCARD QUESTION
Front
Navesti osnove karakteristike rešetkastih nosača u ravni?
Back
Rešetkasit nosač u ravni je kosntrukcija od prostih štapova povezanih u zglobne čvorove, koje prenose opterećenja tako da su štapovi opterećeni samo na pritisak ili zatezanje, a opterećenje se uvodi isključivo u čvorovima.
3.
FLASHCARD QUESTION
Front
Prikazati rezime o redukciji proizvoljnog sistema sila u prostoru:
Back
4.
FLASHCARD QUESTION
Front
Definisati moment sile za osu. Formulisati dva stava u vezi sa pojmom momenta sile za osu?
Back
Moment sile za osu je jednak projekciji vekotra momenta sile određenog na tačku na osi, na posmatranu osu.
1. Stav: Moment sile za osu ne zavisi od izbora redukcione tačke na osi.
2. Stav: Moment sile za osu je jednak nuli ukoliko napadna linija sile seče osu ili je paralelna sa osom.
5.
FLASHCARD QUESTION
Front
Navseti sve slučajeve na koje može da se transformiše sistem sila sa paralelnim napadnim linijama:
Back
1. Jedna rezultantna sila
2. Čist spreg sila
3. Neutralni (nulti) sistem
6.
FLASHCARD QUESTION
Front
Prikazati i objsniti izraz za promenu redukcionog momenta sa promenom redukcione tačke.
Back
7.
FLASHCARD QUESTION
Front
Prikazati postupak slaganja u rezultantu dve sile sa paralelnim napadnim linijama i istim smerovima
Back
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