Physics equations

1. weight = mass x gravitational field strength  W = m g

2. work done = force x distance (along the line of action of the force)   W = F s

3. force applied to a string = spring constant x extension   F = k e

4. moment of a force = force x distance (normal to direction of force)  M = F d

5. pressure = force normal to a surface / area of that surface  P = F/A

6. distance travelled = speed x time  s = v t

    7. acceleration = change in velocity / time taken  a =  v / t

8. resultant force = mass x acceleration  F = m a

9. HT only   momentum = mass x velocity  p = m v

10. kinetic energy = 0.5 x mass x (speed)^2  Ek = 1/2 m v^2

11. gpe = mass x gps x height  Ep = m g h

12. power = energy transferred / time  P = E/t

13. power = work done / time  P = W/t 

14. efficiency = useful output energy transfer/ total input energy transfer

15. efficiency = useful power output/ total power input

16. wave speed = frequency x wavelength  v = f 

17. charge flow = current x time  Q = I t

18. potential difference = current x resistance  V = I R

19. power = potential difference x current  P = V I

20. power = (current)^2 x resistance  P = I^2 R

21. energy transferred = power x time  E = P t

22. energy transferred = charge flow x pd  E = Q V

23. density = mass/volume  p = m/v