# Grade 12 Physical Science Lessons

 Video Description Lesson 1: Momentum In this lesson on Momentum we focus on the following: Defining momentum, impulse and the principle of conservation of momentum. Lesson 2: Mechanics Revision In this lesson on Mechanics Revision we focus on: Resultant force, displacement and distance, velocity and speed, acceleration as well as momentum and impulse. Lesson 3: Vertical Projectile Motion In this lesson on Vertical Projectile Motion we focus on the following: Force of gravity, gravitational acceleration and equations of motion. Lesson 4: Organic Molecules: Hydrocarbons In this lesson on Organic Molecules we focus on the following: Hydrocarbons, saturated hydrocarbons, unsaturated hydrocarbons, isomers, homologous series and functional groups. Lesson 5: Organic Molecules: Functional Groups In this lesson on Organic Molecules we focus on the following: Functional groups, ethers, alcohol, aldehyes, ketones, carboxylic acids as well as esters Lesson 6: Organic Reactions In this lesson on Organic Reactions we focus on the following: Substitution reaction, combustion, hydrogenation, halogenation, hydrohalogenation, hydration and elimination reaction. Lesson 7: Work - Energy In this lesson on Work-Energy we focus on the following: Defining work, components of force and work, kinetic and potential energy, mechanical energy as well as the work-energy theorem. Lesson 8: Power and Mechanics Consolidation In this lesson on Power/Mechanics Revision we focus on the following: Defining power, power and velocity, work and friction, work done on an incline as well as impulse, momentum and power. Lesson 9: Doppler Effect In this lesson on the Doppler Effect we focus on the following: defining the Doppler effect, predicting changes, using the Doppler effect equation to solve problems, identifying whether the sound is subsonic or supersonic as well as finding the mach number for a moving source of sound. Lesson 10: Chemistry Revision In this lesson on Chemistry Revision we focus on the following: the representation of chemical change, writing down chemical formulae, the role of kinetic energy, the collusion theory, energy changes as well as types of chemical reactions. Lesson 11: Rates of Reaction In this lesson on Rates of Reaction we focus on the following: the collision theory, the definition of rate, factors affecting rate as well as graphs. Lesson 12: Chemical Equilibrium In this lesson on Chemical Equilibrium we focus on the following: Associated terminologies, the representation of chemical equilibrium using graphs, the equilibrium constant, Le Chatelier's principle and factors affecting chemical equilibrium. Lesson 13: Electricity Revision In this lesson on Electricity Revision we focus on the following: Coulomb's Law, defining electrical field strength and applying the derived equations, drawing electrical field lines, potential difference as well as understanding capacitance. Lesson 14: Electric Circuits In this lesson on Electric Circuits we focus on the following: Potential difference, current, the resistance of a conductor, Ohm's law and circuit calculations. Lesson 15: Electrodynamics In this lesson on Electrodynamics we focus on the following: Magnetic fields, current-carrying conductors, electromagnetic induction, alternating current as well as direct current. Lesson 16: Photoelectric Effect In this lesson on the Photoelectric Effect we focus on the following: the dual nature of light, particle nature, work function, energy equation as well as ejected electrons and kinetic energy. Lesson 17: Optical Phenomena In this lesson on Optical Phenomena we focus on the following: Light and matter, photons of light, emission spectrum, absorption spectrum, red and blue shift as well as scattering. Lesson 18: Electrochemical Reactions In this lesson on Electrochemical Reactions we focus on the following: Oxidation and reduction, electrochemical cells, standard hydrogen electrode and the table of standard electrode potentials as well as equilibrium in a galvanic cell. Lesson 19: Chemical Industries In this lesson on Chemical Industries we focus on the following: Fertilisers, batteries and the chlor-alkali industry.