Newton ke Teen Laws of Motion: aasan Roman Urdu mein

Likhne wali: Javeria Maqsood, Rehnuma · Aakhri update: 2 November 2026

Newton ke teen laws Physics ki buniyad hain aur Class 9 se FSc tak har imtihan mein aate hain. Is guide mein teeno laws misalon aur numericals ke sath samjhaye gaye hain.

Pehla law: Law of Inertia

Agar koi cheez aaram ki halat mein hai to wo aaram mein hi rehti hai, aur agar wo ek seedhi line mein ek jaisi raftaar se chal rahi hai to usi tarah chalti rehti hai, jab tak us par koi net (kul) force na lage.

Misal: bus achanak brake lagaye to aap aage ki taraf jhukte hain, kyunke aap ka jism pehle ki raftaar mein rehna chahta hai. Is ko inertia kehte hain. Jitna zyada mass, utna zyada inertia.

Doosra law: F = ma

Kisi cheez par lagne wali net force us ke mass aur acceleration ke product ke barabar hoti hai.

F = m × a

F: force, unit newton (N)
m: mass, unit kilogram (kg)
a: acceleration, unit m/s²

Yani 1 N wo force hai jo 1 kg mass mein 1 m/s² acceleration paida kare. Momentum ke lihaz se: F = Δp / Δt.

Hal kiya hua numerical

Sawal: 1200 kg ki car par 3000 N ki net force lag rahi hai. Acceleration kya hogi?

Hal: a = F / m = 3000 / 1200 = 2.5 m/s².

Sawal: 5 kg ke block ko 2 m/s² acceleration dene ke liye kitni force chahiye?

Hal: F = m × a = 5 × 2 = 10 N.

Teesra law: Action aur Reaction

Har action ka barabar aur ulta reaction hota hai.

Misal: aap zameen ko peeche dhakelte hain, zameen aap ko aage dhakelti hai, isi se aap chalte hain. Rocket gas ko neeche phenkta hai aur gas rocket ko oopar dhakelti hai.

Aam ghalti: action aur reaction do alag cheezon par lagte hain, is liye ye ek dusre ko cancel nahi karte.

Imtihan ke liye yaad rakhne ki baatein

Pehla law = inertia, doosra = F = ma, teesra = action-reaction.
Numerical mein pehle given likhein, phir formula, phir units ke sath jawab.
Force ki unit N, mass ki kg, acceleration ki m/s² hoti hai.

Rehnuma se ye sawal poochein

“Newton ka doosra law numerical ke sath samjhao”
“Mere is numerical ko step by step hal karo”
“Inertia ki 5 misalen batao”

Rehnuma kholein: 3 din free

Is topic mein mazeed madad ke liye Physics ka page dekhein.

Aksar poochhe jane wale sawal

Newton ka doosra law kya hai?

Net force = mass × acceleration, yani F = ma. Unit newton hai.

Action aur reaction cancel kyun nahi hote?

Kyunke wo do alag cheezon par lagte hain, ek hi cheez par nahi.