PHYSICS EQUATIONS 0.0 / 5 PhysicsEQUATIONSIGCSEEdexcel Created by: Chelsey`JohnsonCreated on: 02-04-17 20:49 FORCES AND MOTION: average speed average speed = distance moved / time 1 of 31 FORCES AND MOTION: acceleration acceleration = change in velocity / time taken ; a = (v-u)/t 2 of 31 FORCES AND MOTION: unbalanced force F=ma 3 of 31 FORCES AND MOTION: weight W=mg 4 of 31 FORCES AND MOTION: momentum, mass and velocity p=mv 5 of 31 FORCES AND MOTION: force, change in momentum and time taken force = change in momentum / time taken 6 of 31 FORCES AND MOTION: moment m=fd 7 of 31 FORCES AND MOTION: Hooke's law f is proportional to e 8 of 31 FORCES AND MOTION: astronomy orbital speed = 2пr / T 9 of 31 ELECTRICITY: mains - power P = IV 10 of 31 ELECTRICITY: mains - energy transferred E = IVt 11 of 31 ELECTRICITY: energy and p.d. in circuits V = IR 12 of 31 ELECTRICITY: mains - charge Q = It 13 of 31 WAVES: wave speed wavespeed = frequency x wavelength 14 of 31 WAVES: frequency and time period f = 1 / t 15 of 31 WAVES: light - refractive index n = sin i / sin r 16 of 31 WAVES: light - critical angle and refractive index sin c = 1 / n 17 of 31 ENERGY: transfer - efficiency efficiency = useful energy output / total energy input 18 of 31 ENERGY: work and power - work done W = fd 19 of 31 ENERGY: work and power - GPE GPE = mgh 20 of 31 ENERGY: work and power - kinetic energy KE = 0.5mv ² 21 of 31 ENERGY: work and power - power and work done P = W / t 22 of 31 SOLIDS, LIQUIDS AND GASES: density density = mass / volume 23 of 31 SOLIDS, LIQUIDS AND GASES: pressure p = F / A 24 of 31 SOLIDS, LIQUIDS AND GASES: pressure difference pressure = height x density x g 25 of 31 SOLIDS, LIQUIDS AND GASES: pressure and temperature - gas p1 / T1 = p2 / T2 26 of 31 SOLIDS, LIQUIDS AND GASES: pressure and volume - gas p1V1 = p2V2 27 of 31 ELECTROMAGNETISM: electromagnetic induction - voltages and turns in a transformer input (primary) voltage / output (secondary) voltage = primary turns / secondary turns; Vp / Vs = np / ns 28 of 31 ELECTROMAGNETISM: electromagnetic induction - input power for 100% efficiency input power = output power; VpIp = VsIs 29 of 31 RADIOACTIVITY: alpha decay atomic number -2, mass number -4, + helium 30 of 31 RADIOACTIVITY: beta decay mass number +1, + electron 31 of 31

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