Esifundweni sefiziksi esedlule, kwafundwa isihloko esiyinhloko. amandla ezinhlayiya dan amandla okujikelezaKu-particle dynamics sifunda izinhlayiya ekuhambeni kokuhumusha (ukunyakaza okuqondile, ukunyakaza okujikelezayo, ukunyakaza kwe-parabolic). Kuma-dynamics ajikelezayo, sifunda ngemizimba eqinile ejikelezayo. Kulesi sihloko, sifunda izinto ngokulingana. Kunezinhlobo ezimbili zokulingana: ukulingana okungaguquki kanye nokulingana okuguquguqukayo. Ngokomthetho wokuqala kaNewton, into isesimweni sokulingana okungaguquki uma iphumule, kanti into isesimweni sokulingana okuguquguqukayo uma ihamba ngesivinini esingaguquki. Leli phepha ligxila kakhulu engxoxweni yokulingana okungaguquki (izinto eziphumule).
Okusalungiswa ukulingana komzimba okuqinile ulwazi oluyisisekelo olubaluleke kakhulu futhi lunezinhlelo eziningi ekuphileni kwansuku zonke, ikakhulukazi emkhakheni wobunjiniyela. Ukuqonda nokubala amandla asebenza ezintweni ezisesimweni sokulingana okungaguquki kubaluleke kakhulu, ikakhulukazi kochwepheshe bezobuchwepheshe (abaklami bezakhiwo noma onjiniyela). Ekuklameni into ethile, kungaba isakhiwo, ibhuloho, imoto, njll., abaklami bezakhiwo noma onjiniyela babala ngokucophelela ukuthi isakhiwo sesakhiwo, imoto, ibhuloho, njll., siyakwazi yini ukumelana namandla asebenza kuso ukuze singawi.
Isibonelo sezinkinga
1. Cabanga ngesithombe esilandelayo! Induku engu-1,5 kg iboshwe ngentambo iqonde odongeni ngakolunye uhlangothi, bese kulenga isibani ebangeni elithile ukusuka entanjeni. Ukuqina kwentambo ukugcina induku ilingana…
Ingxoxo
Kuyaziwa:
Isisindo somthwalo (m1) = 2 kg
Isisindo senduku (m2) = 1,5 kg
Ukusheshisa ngenxa yamandla adonsela phansi (g) = 10 m/s2
Isisindo somthwalo (w1) = (2)(10) = 20 Newton
Isisindo sebha (w)2) = (1,5)(10) = 15 N
Kubuziwe: Ubukhulu bokucindezeleka entanjeni ukuze induku ilingane
Impendulo:
Ubude bentambo bubalwa kusetshenziswa ifomula kaPythagorean:
Bala amandla okucindezela entambo (T)):
Khetha i-axis yokujikeleza e-hinge. Cabanga ngesikhathi samandla asebenza endukwini.
Isikhathi Samandla 1:
τ1 = w2 r2 = (15 N)(0,4 m) = -6 Nm
Umzuzu wamandla 1 ubangela ukuthi induku ijikeleze ngokwewashi ukuze lowo mzuzu wamandla 1 ube nophawu olubi.
Isikhathi Samandla 2:
τ2 = w1 r1 = (20 N)(0,6 m) = -12 Nm
Umzuzu wamandla 2 ubangela ukuthi induku ijikeleze ngokwewashi ukuze lowo mzuzu wamandla 1 ube nophawu olubi.
Isikhathi Samandla 3:
τ3 = Tr3 Isono θ = (T)(0,8)(0,6/1) = 0,48T
Umzuzu wamandla 3 ubangela ukuthi induku ijikeleze ngokuphambene newashi ukuze lowo mzuzu wamandla 3 ube nophawu oluhle.
Ukuze uhlelo luhlale lunganyakazi, umzuzu wamandla ophumela (Στ) = 0
Στ = 0
τ1 + τ2 + τ3 = 0
– 6 – 12 + I-0,48T = 0
– 18+ I-0,48T = 0
I-0,48T = 18
T = 18/0,48
T = 37,5 Newton
Umthombo wombuzo:
Imibuzo Yefiziksi Yezivivinyo Zikazwelonke Zesikole Samabanga Aphezulu/Isikole Samabanga Aphezulu Sokufundela Umsebenzi
