physics - all formulas ALL THE FORMULAS NEEDED FOR IGCSE SCIENCE - PHYSICS 4.0 / 5 based on 2 ratings ? PhysicsEquations and FormulaeGCSEAll boards Created by: stuDYINGCreated on: 18-01-10 15:07 FORCES & MOTION AVERAGE SPEED = distance moved / time taken SPEED = distance / time ACCELERATION = change in velocity / time taken a = (v - u) / t speed = m/s distance = metres time = seconds final speed & starting speed = m/s FORCE = mass x acceleration WEIGHT = mass x gravity force = newtons mass = kg acceleration = m/s/s 1 of 5 ELECTRICITY POWER = current (I) x voltage (V) power = watts (W) voltage = volts (V) current = amperes (A) ENERGY TRANSFERRED = I x V x t (P x t) VOLTAGE = I x resistance resistance = ohms charge (Q) = current x time charge= coulomb (C) POTENTIAL DIFFERENCE = energy transferred / chargeenergy = Joules 2 of 5 WAVES wave speed (v) = frequency x wavelength wave speed = m/s frequency = hertz (Hz) wavelength = m frequency = 1 / time period 3 of 5 LIGHT AND SOUND / ENERGY TRANSFER n (refractive index) = sin i / sin r sin c (critical angle) = 1 / n ENERGY TRANSFERefficiency = useful energy output / total energy output x 100 WORK AND POWER work = force x distance power = work done / time taken gravitational potential energy (GPE) = m x g x height kinetic energy = 1/2 x mass x velocity (squared) 4 of 5 DENSITY AND PRESSURE density = mass / volume pressure = force,/ area P1V1 = P2V2 5 of 5
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