IGCSE Physics Formulae 3.0 / 5 PhysicsEquations and FormulaeIGCSEEdexcel Created by: YasmeenCreated on: 13-04-13 12:04 Average Speed? distance / time 1 of 22 Force? mass x acceleration 2 of 22 Acceleration? chance in velocity / time taken 3 of 22 Momentum? mass x velocity 4 of 22 Density? mass / volume 5 of 22 Efficiency? useful energy output / total energy input x 100% 6 of 22 Work Done? force x disrance moved in direction of force 7 of 22 Energy Transferred? work done 8 of 22 Kinetic Energy? 1/2 x mass x speed (squared) 9 of 22 Change in Gravitational Potential Energy? mass x gravitational field strength x change in height 10 of 22 Weight? mass x gravitational field strength 11 of 22 Pressure? force / area 12 of 22 Moment? force x perpendicular distance from pivot 13 of 22 Charge? current x time 14 of 22 Voltage? current x resistance 15 of 22 Electrical Power? voltage x current 16 of 22 Wave Speed? frequency x wavelength 17 of 22 In a transformer : Input Power = ? output power 18 of 22 Vp / Vs = ? np / ns (number of turns) 19 of 22 Refractive Index? n = sin i / sin r 20 of 22 The Relationship between Refractive Index and Ccritical Angle? sin c = 1/n 21 of 22 Pressure Difference? density x height x g 22 of 22

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