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physical science physics chemistry mechanics force inclined plane ideal gas gases gas projectile motion electrostatics bonding kinetic theory pressure volume lewis diagram temperature ideal gas laws lewis dot covalent bonds photoelectric effect kinematics photons free fall cut-off frequency particle nature of light photoelectric emission work function attraction optical phenomena optics electric charge attract charge covalent bond acceleration due to gravity neutral friction force static friction kinetic friction light bond formation projectile hydrogen single bond co-ordinate bond hemistry dative bond double bond triple bond normal force free body diagram acceleration velocity molecular structure molecular polarity electronegativity bond polarity equations of motion molecule molecular shape electronegativity difference graphs atom polarity bond length bond energy chemical potential energy positive kelvin charles' law real gas comparison universal gas equation universal gas constant gas equations pv=nrt emission spectrum spectra absorption spectrum absorption spectra emission spectra spectrum light as wave quantum theory energy per photon calculations e=hf kinetic energy worked examples frequency intensity negative charging static electricity repulsion repel electrostatic force polarisation polarization discharge electrical discharge quantization of charge potential difference electron charged state pd phases solid moles microscopic particle model of matter liquid inverse proportion boyle's law incident light