Equations 5.0 / 5 PhysicsEquations and FormulaeGCSEEdexcel Created by: daisy.leesCreated on: 19-05-15 14:00 Average speed Average speed = distance / time 1 of 22 Force Force = mass x acceleration 2 of 22 Acceleration Acceleration = change in velocity / time taken 3 of 22 Momentum Momentum = mass x velocity 4 of 22 Density Density = mass / volume 5 of 22 Efficiency Efficiency = useful energy output from the system / total energy input to the system x 100 6 of 22 Work done Work done = force x distanced moved in direction of force 7 of 22 Energy transfered Energy transfered = work done 8 of 22 Kinetic energy Kinetic energy = 1/2 x mass x speed2 9 of 22 Change in gravitational potential energy Change in gravitational potential energy = mass x gravitational field strength 10 of 22 Change in gravitational potential energy Change in gravitational potential energy = mass x gravitational field strength x height 11 of 22 Weight Weight = mass x gravitational field strength 12 of 22 Pressure Pressure = force / area 13 of 22 Moment moment = force x perpendicular distance from pivot 14 of 22 Charge Current = Current x time 15 of 22 Voltage Voltage = current x resistance 16 of 22 Electrical power Electrical power = voltage x current 17 of 22 Wave speed Speed = frequency x wave length 18 of 22 input power = output power Input voltage / output voltage = primary turns / secondary turns 19 of 22 V Vp / Vs = Np / Ns 20 of 22 N N = Sin i / Sin r 21 of 22 Pressure difference Pressure difference = height x density x g 22 of 22

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