Physics Equations Mind Map

Physics Equations Mind Map

1. Newtons Laws

   • 1st Law:
     • If there is no resultant force acting on an object it will move with constant velocity
   • 2nd Law
     • If resultant force acts on a body, the body will accelerate in the direction of the force
       • F = ma
   • 3rd Law
     • Every action has an equal and opposite reaction

2. Waves

   • frequency = number of waves / time
   • Refractive index = speed of light in vacuum / speed of light in medium
   • Snells Law: Ni sin(i) = Nr sin(r)
   • Wavelength(m) = v / f
   • Total internal reflection occurs when a wave hits the boundary between two substances at an angle greater than the critical angle
   • One oscillation(s) = 1/f

3. Momentum

   • Impulse
     • Resultant force x time = change in momentum
   • P = mass x velocity (kgm/s)
   • KE = P² / 2m
   • After a collision, momentum remains the same as before the collision
     • m1 v1 = m2 v2

4. Power = energy supplied / time

   • Power = work done (J) / time(s)

5. Gain in KE = Loss in GPE

   • v = √2gh

6. Circular Motion Equation

   • F = m v ² / r

7. Moment = force x distance

8. F = ma

9. a = v-u / t

10. S = d / t

11. KE = 1/2 m v²

12. Velocity = displacement / time

13. Pressure

    • Pressure in Liquid = height x density x gravity
    • force / area
    • p1 v1 = p2 v2
      • Pressure of a gas is inversely proportional to its volume
    • p1 / t1 = p2 / t2
      • Temperature must be in kelvin

14. GPE = mgh

15. Work done = force x distance in direction of travel

16. Specific Latent Heat

    • Tells us how much energy is needed to change the state of a mass of a substance at constant temperature
    • E = mL

17. Efficiency = useful energy in / total energy in

18. Energy supplied = power x time

19. Density = mass / volume

20. Weight = mass x gravity