Uma kukhona amandla avelayo entweni enesisindo u-m, khona-ke into ihamba ngendlela eqondile ngokusheshisa u-a. Ubudlelwano phakathi kwamandla avelayo, isisindo kanye nokusheshisa buvezwa ngesibalo:
Lesi yisibalo somthetho wesibili kaNewton owafundwa ekilasini X.
Inani elibonakalayo ekunyakazeni okujikelezayo elifana namandla aphumayo ekunyakazeni okuqondile liwumzuzu wamandla ophumelayo . Inani elibonakalayo ekunyakazeni okujikelezayo elifana nobunzima ekunyakazeni okuqondile liwumzuzu wokungakhathali . Inani elibonakalayo ekunyakazeni okujikelezayo elifana nokusheshisa ekunyakazeni okuqondile yi -angular acceleration.
Uma kukhona umzuzu wamandla ophumela entweni enayo umzuzu wokungakhathali bese into ijikeleza nge ukusheshisa kwe-angular ngokuqinisekile. Ubudlelwano phakathi komzuzu wamandla ophumelayo, umzuzu wokungaqhubeki kanye nokusheshisa kwe-angular kuvezwa nge-equation:
Isibalo somthetho wesibili kaNewton wokunyakaza okujikelezayo sifana nesibalo somthetho wesibili kaNewton wokunyakaza okuqondile.
Isibonelo sezinkinga
1. I-pulley yediski eqinile enesisindo esingu-1 kg kanye ne-radius engu-10 cm inentambo eboshwe onqenqemeni lwayo, futhi isisindo esingu-1 kg silenga kolunye uhlangothi lwentambo. Ake sithi intambo ayinasisindo. Thola ubukhulu bokusheshisa kwesisindo phansi. g = 10 m/s2.
Ingxoxo
Kuyaziwa ukuthi:
F = w = mg = (1)(10) = 10 amaNewton
r = 0,1 imitha
Umbuzo: ukusheshisa umthwalo (a)?
Impendulo:
Bala isikhathi sokungakhathali kanye nesikhathi samandla:
Isikhathi sokungaqhubeki kwe-pulley yediski eqinile:
Mina = ½ uMnu.2 = ½ (1)(0,1)2 = (0,5)(0,01) = 0,005 kg m2
Isikhathi samandla:
Ukusheshisa kwe-angular kwe-pulley:
Ukusheshisa komthwalo okuqondile:
2. I-pulley yediski eqinile enobunzima obungu-2M kanye ne-radius engu-R, igoqwa onqenqemeni ngentambo, bese umthwalo wobunzima obungu-m ulengiswe kolunye uhlangothi lwentambo. Lapho umthwalo ukhishwa, i-pulley ijikeleza ngokusheshisa kwe-angular kwe -alphaUma into enesisindo esingu-M inamathele ku-pulley, i-pulley izojikeleza ngokusheshisa okufanayo kwe-angular, isisindo somthwalo kumele senziwe... (I-pulley = ½ MR2)
Ingxoxo
I-Diketahui :
Isisindo se-pulley yediski eqinile = 2M
Irediyasi yepulley yediski eqinile = R
Isisindo somthwalo = m
Kubuziwe :
Isisindo somthwalo?
Impendulo:
Bala isikhathi sokungabi namandla kwe-pulley yediski eqinile, ngaphambi nangemva kokuthi into enesisindo u-M inamathele kuyo:
Isikhathi sokungakhathali 1:
Mina = ½ uMnu.2 = ½ (2M)(R)2 = MR2
Isikhathi sokungakhathali 2:
Mina = ½ uMnu.2 = ½ (2M + M)(R)2 = ½ (3M)(R)2 = 1,5 MR2
Isikhathi samandla esibangelwa umthwalo osesipijini:
Ukusheshisa kwe-angular kwe-pulley kuyafana, kokubili ngaphambi nangemva kokuthi into enesisindo esingu-M inamathiselwe.
Isisindo somthwalo = izikhathi ezingu-1,5 zesisindo somthwalo wokuqala
