Newton ke teen pramukh niyam hain:
* Pehla Niyam (Jadatv): Koi vastu apni sthiti tab tak nahi badalti jab tak us par koi bahari bal (force) na lage.
* Doosra Niyam (F = ma): Kisi vastu par lagaya gaya bal uske dravyaman (mass) aur twaran (acceleration) ke gunanfal ke barabar hota hai.
* Teesra Niyam: Har kriya ki hamesha ek saman aur viprit pratikriya hoti hai.
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