Formulae Physics for Sikkim PSC
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No.  Mechanics  
1.  Linear motion with constant acceleration 

2.  Relative motion 

3.  Momentum of a particle 

4.  Newton’s experimental law (NEL) 

5.  Conservation of momentum 

6.  Impulse (change in momentum) 

7.  Angle in radians 

8.  Angular velocity 

9.  Linear velocity and angular velocity 

10.  Centripetal acceleration 

11.  Centripetal force 

12.  Newton’s law of gravitation 

13.  Force and acceleration 

14.  Weight and acceleration due to gravity 

15.  Period of a satellite 

16.  Moment of a force 

17  Torque of a couple 

Centres of gravity  
1.  Hemisphere, radius 

2.  Hemispherical shell, radius 

3.  Right circular cone 

4.  Triangular lamina 

5.  Arc, radius , angle 

6.  Sector of disc, radius , angle 

Moment of Inertia  
1.  Uniform rod, length 

2.  Uniform disc, radius 

3.  Uniform hoop, radius 

4.  Uniform solid sphere, radius 

5.  Parallel axis theorem 

6.  Perpendicular axis theorem 

7.  Hooke’s law 

8.  Simple harmonic motion 

9.  Simple pendulum 

10.  Compound pendulum 

11.  Work 

12.  Potential (gravitational) energy 

13.  Kinetic energy 

14.  Principle of conservation of mechanical energy 

15.  Massenergy equivalence 

16.  Power 

17.  Percentage efficiency 

18.  Young’s modulus 

19.  Stress 

20.  Strain 

21.  Density 

22.  Pressure 

23.  Pressure in a fluid 

24.  Thrust on an immersed plane surface 

25.  Boyle’s law 

Heat and temperature  
1.  Celsius temperature 

2.  Energy needed to change temperature 

3.  Energy needed to change state 

Waves  
1.  Velocity of a wave 

2.  Doppler effect 

3.  Fundamental frequency of a stretched string 

4.  Mirror and lens formula 

5.  Magnification 

6.  Power of a lens 

7.  Two lenses in contact 

8.  Refractive index 

9.  Diffraction grating 

Electricity  
1.  Coulomb’s law 

2.  Electric field strength 

3.  Potential difference 

4.  Ohm’s law 

5.  Resistivity 

6.  Resistors in series 

7.  Resistors in parallel 

8.  Wheatstone bridge 

9.  Joule’s law 

10.  Force on a currentcarrying conductor 

11.  Force on a charged particle 

12.  Induced emf 

13.  Alternating voltage and current 

14.  Capacitance 

15.  Parallelplate capacitor 

16.  Energy stored in capacitor 

17.  Power 

18.  Magnetic flux 

19.  Transformer 

Modern physics  
1.  Energy of a photon 

2.  Einstein’s photoelectric equation 

3.  Law of radioactive decay 

4.  Halflife 

5.  Massenergy equivalence 
