Nthawi ya kutopa

Nthawi Yopanda Kuvutika Kwambiri

Pali zinthu ziwiri, chimodzi mwa izo chili ndi kulemera kochepa ndipo china chili ndi kulemera kwakukulu. Ndi chinthu chiti chomwe chili chosavuta kusuntha ngati chikakankhidwa ndi mphamvu yomweyo? Zoona zake zikusonyeza kuti zinthu zomwe zili ndi kulemera kochepa zimakhala zosavuta kusuntha kuposa zinthu zomwe zili ndi kulemera kwakukulu. Chifukwa chake kukula kwa kulemera kwa chinthucho kumatsimikiza kukula kwa kuthamanga kwa chinthucho ngati mphamvu ikugwiritsidwa ntchito. Ngati mukuyenda molunjika, kulemera kwa chinthucho kumatsimikiza ngati chinthucho chili chosavuta kapena chovuta kusuntha (kufulumizitsa) ndiye kuti mukuyenda kozungulira, mphindi ya kulephera kwa chinthucho imatsimikiza ngati chinthucho chili chosavuta kapena chovuta kusuntha.

chidutswa
Taganizirani za tinthu tozungulira. Tinthu tomwe tili ndi kulemera kwa m timapatsidwa mphamvu F kuti tinthuto tizizungulira mozungulira mzere wa kuzungulira O. Tinthuto tili mtunda wa r kuchokera ku mzere wa kuzungulira. Poyamba tinthuto timakhala kuti tapumula (v = 0). Pambuyo posunthidwa ndi mphamvu F, tinthuto timazungulira pa liwiro linalake kotero kuti tinthuto timakhala ndi mphamvu yothamanga (tan).
Ubale pakati pa mphamvu (F), kulemera (m), ndi kufulumira kwa tangential (tan) ya tinthu tating umafotokozedwa ndi equation iyi:
Tinthu timeneti timazungulira kotero kuti tinthu timeneti timakhala ndi kufulumira kwa angular. Ubale pakati pa kufulumira kwa tangential ndi kufulumira kwa angular umafotokozedwa ndi equation:
Sinthani kapena sinthani tangential acceleration (tan) mu equation 3 ndi tangential acceleration (tan) mu equation 4.
Lonjezerani mbali zakumanzere ndi zakumanja ndi r:
r F ndi nthawi ya mphamvu ndipo a Mr.² ndi nthawi ya kusakhala ndi mphamvu kwa tinthu tating'onoting'ono I). Equation 5 ikunena za ubale pakati pa nthawi ya mphamvu, nthawi ya kusakhala ndi mphamvu ndi kufulumira kwa angular kwa tinthu tating'onoting'ono tozungulira. Equation 5 ndi equation yachiwiri ya Newton ya tinthu tating'onoting'ono tozungulira.
I ndi chinthu chomwe chimachokera ku kulemera kwa tinthu tating'onoting'ono (m) ndi sikweya ya mtunda wa tinthu tating'onoting'ono kuchokera ku mzere wozungulira (r).²).
Zambiri:
I = mphindi ya kusakhala ndi mphamvu kwa tinthu tating'onoting'ono, m = kulemera kwa tinthu tating'onoting'ono, r = mtunda pakati pa tinthu tating'onoting'ono ndi mzere wozungulira
Equation 6 imagwiritsidwa ntchito kudziwa nthawi ya inertia ya tinthu tozungulira.
Kuti mumvetse bwino ndemanga yokhudza nthawi ya inertia ya tinthu tating'onoting'ono, chonde phunzirani zitsanzo za mavuto a tinthu tating'onoting'ono tomwe tili ndi vuto la inertia.

Thupi lolimba lofanana
Thupi lolimba limapangidwa ndi tinthu tambirimbiri tomwe timafalikira m'thupi lonse. Nthawi ya thupi lolimba ndi chiŵerengero cha mphindi zonse za tinthu tating'onoting'ono tomwe timapanga thupi lolimba.
Kuti mudziwe I wa chinthu cholimba, chinthucho chimawonedwa pamene chikuzungulira chifukwa malo a mzere wozungulira amakhudza mtengo wa mphindiyo. Kuwonjezera pa kutengera malo a mzere wozungulira, I wa tinthu tating'onoting'ono timadaliranso kulemera kwa tinthu tating'onoting'ono (m) ndi sikweya ya mtunda wa tinthu kuchokera ku mzere wozungulira (r).²). Kulemera kwa tinthu tonse tomwe timapanga chinthu ndi kofanana ndi kulemera kwa chinthucho. Vuto ndilakuti, mtunda wa tinthu chilichonse kuchokera ku mzere wozungulira umasiyana.
Taganizirani za njira yopezera mphete yopyapyala ya radius R ndi kulemera kwa M. Ngati mzere wozungulira uli pakati pa mphete, ndiye kuti tinthu tonse tomwe timapanga mpheteyo tili patali ndi r kuchokera ku mzere wozungulira. I wa mphete yopyapyala ndi wofanana ndi kuchuluka kwa mphindi za tinthu tonse tomwe timapanga mpheteyo.
Tinthu tating'onoting'ono tomwe timapanga mphete yopyapyala tili patali ndi r kuchokera ku mzere wozungulira kotero kuti r₁ =r₂ =r₃ = r = R.
Fomula ya mphete yopyapyala:
Ine = MR²
Zambiri:
I = mphindi ya inertia ya mphete yopyapyala, M = kulemera kwa mphete yopyapyala, R = radius ya mphete yopyapyala
Nanga bwanji ngati mzere wozungulira suli pakati pa mphete? Ngati mzere wozungulira suli pakati pa mphete, njira ya mphete yopyapyala singapezeke pogwiritsa ntchito njira yomwe ili pamwambapa chifukwa mtunda wa tinthu tating'onoting'ono kuchokera ku mzere wozungulira umasiyana.

Fomula ya thupi lolimba lofanana
Zotsatirazi ndi njira za matupi angapo olimba ofanana.

Chitsanzo cha mavuto

1. Mafunso a Mayeso a Dziko Lonse a SMA/MA a 2017

Samalani tebulo lotsatira!

Zinthu P, Q, ndi R zimalumikizidwa ndi ndodo yopanda mass. Kukula kwa nthawi ya inertia ya dongosololi pafupi ndi mzere wolunjika ku ndege kudzera mu mzere wa chinthu P ndi…

Zokambirana

Ndizodziwika kuti:

Anafunsa: Nthawi ya kusakhazikika kwa dongosololi

Yankho:

Nthawi ya kulephera kwa chinthu Q:

Q ₌ mr ² = (0,5)(10 ² ) = (0,5)(100) = 50 kg m ²

Nthawi ya kusakhala ndi mphamvu kwa chinthu R:

I _R = mr ² = (3)(6 ² ) = (3)(36) = 108 kg m ²

Nthawi ya kulephera kwa chinthu P:

Mzere wozungulira umadutsa mu mzere wa chinthu P kotero kuti r = 0.

Nthawi ya kusakhazikika kwa dongosolo:

I = 50 kg m ² + 108 kg m ²

I = 158 kg m ²