Physics Revision Notes PDF

er11 Physical Quantities Examples of physical quantities speed mass length temperature etc SI System 7 Base units which all units are derived from onlyneed to know 6 Quantity...

er11 Physical Quantities Examples of physical quantities speed mass length temperature etc SI System 7 Base units which all units are derived from onlyneed to know 6 Quantity Unit Symbol Mass Kilogram Kg Time Second S length Metre M ElectricCurrent Ampere A Temperature Kelvin K Filiusintensity Candela ad Amount mole mol ofSubstance Multiples submultipes of these baseunits suchas mm or km are shownthroughprefixes Prefix MultiplyingFactor Symbol Tera 10 T Giga 10 G Mega 10 M kilo 10 K cent 10 c milli 10 m micro 106 µ nano 10 n pico 10 Pf femto 10  Derived Units all other physical quantities except base units Shysical Quantity Defined as Unit SpecialNames Velocity different ms Maskolume 3 Density Kgm Momentum Massxvelocity kg.ms1 Force MassxAcceleration Kgms Newton N Pressure ForcelArea Kgm's Pascal Pa f Workenergy Force Distance Kgm s Joule J Tower worktime Kym's Watt w t.fifffce kfjm.is t ffnTfn Finding baseunits from a given equation Homogenous Equations valid equationswhich makesense as bothsides areequal int gen shsid 90sh is homogenous E.se EE c.ie 1atuathg Etn T 2T Mxa T 2T Kgms 11S onbonsides T 274 E's 1 cm really sans 0.01m xo.am o.am to 0m 111 pE Importance of significant figures your answer isonly as accurate as thedatayou a  Chapter Scalars and Vectors A vector is a physical quantity that needs magnitude a unit and a direct A scalar is a physical quantity that requires only magnitude and a unit Vector Scalar Displacement Distance Velocity Speed Acceleration Rateofchangeofspeed Force Time ElectricCurrent ElectricCharge Momentum KineticEnergy Temperature Area Volume Mass Combininglectors Vectors magnitude direction Shown throughlengthof arrow Show.to h u9phoiheg When adding Vectors finalvector theresultant Aft lift I eg.ggFsnre EEIsn  I IE quted Thedirection indegreeswithrespect t.eittg.EE in atiIredwith Mathematical Solution Trig Pythagoras e g Resfcing 10N known cos if anglecosse If horizontal 10 sina.ee sto intion Equilibriumofforce ue forcesactingin twoperpendiculardirections Translational equilibrium The object is in equilibrium if the forcesup equal theforces down and the forces acting to the leftequalthoseacting to the right Eg Is theobjectin ualequilibrium  y direction SN res 5 cos 53 3 09N E 3N 1 1 res I 5sins 93N 4N Fup Foon and Frett Fright the objectis in translational equilibrium When an objectis in equilibrium forcesacting on it are taken in order nosetoto 111 Sometimes need to find forces to restore equilibrium Magnitude omÉt Angle tan E PJife.tt thnA 3B Iii A B FEI TEA a Chapter 1.3 Principle of Moments Chapter  ElectricCurrentCharge PotentialDifference andElectromotiveforce ChapterI Current ectric therateofflowof charge at a point Coulomb 1 coulomb is the amount of charge that passes a point when a current of 1 ampere flowsfor 1 second Charge of one electron 116 70 C No ofelections electrontoosmalltobeused as unitforcharge Electron Charge carrier Q It times Chakrge curtently s datareeiieiiiiaiiaes.es Conventional current Charge per unit time transported in a cert direction Electron flow the electrons flow out of the negative terminal through the circuit into the positiveterminal oftheson force The energy converted into electrical energywh Electraoyagting unit charge 1C passesthrough it the.pe EE E.theterminal E Elertgi cthargek Ii PotentilDiffeence The electrical energy transferred to otherforms when unit charge passes between two points the pid theload resistance also the Tepid across the terminals of the celt pod across is wastedlostdetointernalresistance energy Voltmeter measure energy change 1 Volt When 1 Coulomb passesbetween 2 pointsandtransfers 1 Jouleo energy 1 V 1 J per c Electrical Power the rate at which electricalenergy is converted into other forms of energy byacircuit or componentsuchas a resistorin a circuit PIVderivedfrom P I Potential Difference Exv IV Payer Cafrent  Chapter11 Resistance Resistivity feGEsistIPefjivedhfmeriEPPE.it metp.tt i isMmE mt5etwetehnk9hpoGYQEt it Electrical resistance Opposition to the flow of current through a metal can by collisions between free electrons andthemetalatom Resistance in Series Circuits g.fi hrg Az Fate Hamff Rota R Re R3 Current is same at all points in a circuit TotalResistance IEEE The Pid is across each component add up to the Pid ofthe power supply Resistance in Parallel Circuits hear HA FLIP 1T had resistors Parallel It t.tt  TheslÉoÉhÉu nÉÉÉhteach to the totalcurven taken fromthe supply Fsisfoliffual 1 R Resistance t to