# Equations in a nutshell

- Created by: shanij
- Created on: 14-04-13 13:31

First 193 words of the document:

IGCSE Equations in a nutshell

1. Speed =distance/time

2. Acceleration = (final velocity initial velocity)/time

3. Stopping distance = thinking distance + braking distance

4. Resultant force = mass x acceleration

5. Weight = mass × gravitational field strength

6. Moment = force × perpendicular distance from pivot

7. Current =charge flow/time

8. Potential difference/voltage= energy changed /charge

9. Power = energy transferred / time

10. Power = work done/time taken

11. Electrical power = Current x voltage

12. Electrical energy transferred = current x voltage x time

13. Resistance = voltage/current

14. Electrical energy = power x time

15. Frequency = 1/time period

16. Wave speed = frequency x wavelength

17. n=sin i /sin r

18. n=1 /sin c

19. Efficiency = (useful energy output/total energy input ) x 100%

20. Work done= force x distance moved in direction of force

21. Kinetic energy = ½ × m v2

22. Gravitational potential energy = mgh

23. Density = mass / volume

24. Pressure = force/area

25. pressure of a column of a liquid is density x acceleration due to

gravity x height of column

26. P1V1=P2V2

27. Temperature in Kelvin = temperature in Celsius + 273

The equations in bold are given on the exam paper

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