15 Important Physics Formulas for Class 11 & 12 Students | Complete Revision Notes 2026
15 Important Physics Formulas
Complete Revision Notes for Class 11 & 12 Science Students (Hinglish)
📘 Introduction
Physics ek aisa subject hai jisme numericals aur concepts dono equally important hote hain. Agar aap Bihar Board, CBSE, JEE ya NEET ki preparation kar rahe hain to sabse pehle important formulas yaad hone chahiye.
Is article me hum Class 11 aur Class 12 ke 15 sabse important Physics formulas share kar rahe hain jo exams me baar-baar puche jaate hain. Har formula ke saath uska use bhi diya gaya hai taaki revision aur bhi easy ho.
1. Speed Formula
Formula
Speed = Distance / Time
Use: Kisi object ki speed calculate karne ke liye.
SI Unit: m/s
Example:
Distance = 100 m
Time = 20 s
Speed = 100/20 = 5 m/s
2. Velocity Formula
Formula
Velocity = Displacement / Time
Use: Direction ke saath speed nikalne ke liye.
SI Unit: m/s
3. Acceleration Formula
Formula
a = (v-u)/t
Where
- u = Initial Velocity
- v = Final Velocity
- t = Time
Use: Velocity change calculate karne ke liye.
4. Newton's Second Law
Formula
F = ma
Use: Force calculate karne ke liye.
Unit: Newton (N)
5. Momentum
Formula
P = mv
Use: Moving body ka momentum calculate karne ke liye.
6. Work Formula
Formula
W = F × S
Use: Work done calculate karne ke liye.
Unit: Joule (J)
7. Power Formula
Formula
Power = Work / Time
Unit: Watt (W)
8. Kinetic Energy
Formula
KE = ½ mv²
Use: Moving body ki energy.
9. Potential Energy
Formula
PE = mgh
Use: Height ki wajah se stored energy.
10. Ohm's Law
Formula
V = IR
Use: Current, Voltage aur Resistance ke relation ke liye.
11. Electric Power
Formula
P = VI
Use: Electrical Power calculate karne ke liye.
12. Wave Speed
Formula
v = fλ
Use: Wave ki speed calculate karne ke liye.
13. Lens Formula
Formula
1/f = 1/v − 1/u
Use: Ray Optics numericals.
14. Mirror Formula
Formula
1/f = 1/v + 1/u
Use: Mirror image formation.
15. Universal Gravitation
Formula
F = Gm₁m₂/r²
Use: Do objects ke beech gravitational force calculate karne ke liye.
🎯 Exam Preparation Tips
- ✔ Har formula ki SI Unit yaad rakho.
- ✔ Formula ke variables ka meaning samjho.
- ✔ Roz 15–20 numericals solve karo.
- ✔ NCERT examples zaroor practice karo.
- ✔ Formula Revision Sheet banakar daily revise karo.
Final Words
Ye 15 Important Physics Formulas Class 11 aur 12 ke students ke liye sabse useful formulas hain. Agar aap Bihar Board, CBSE, JEE ya NEET ki preparation kar rahe hain, to in formulas ko achhi tarah revise karein aur numericals ke saath practice karein. Regular revision hi Physics me high score ka secret hai.