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CLASS 8 – PHYSICS with following topics explained in details: Unit 1. The Universe Unit 2. Light Unit 3. Magnetism and Electricity Unit 4. Sources of Energy Unit 5. Sound Unit 6. Friction Unit 7. Pressure
CLASS 8 – PHYSICS
Unit 1. The Universe
Introduction, The Universe, Galaxy, Stars, Planets and its classification, Difference between Stars and Planets, Light year, The Solar System, The Sun, Planets, Constellations, Comets, Meteors and Meteorites, Asteroids, Natural and Artificial Satellites, Functioning of a communication satellite, Applications of artificial satellite, Orbital velocity, Weightlessness in space flight, Synchronous satellite or geostationary satellite, Escape velocity, The Moon, Phases of moon, Summary
Unit 2. Light
Introduction, Optical density, Refraction, Effects of refraction, Refractive index, Refraction through glass slab, Refraction through a prism, Dispersion of light, The rainbow, Lenses, Terms related to lenses, Lens as combination of slabs and prisms, Images in concave and convex lenses, Optical instruments, Microscope, Telescope, Photographic camera, Eye, Summary
Unit 3. Magnetism and Electricity
Introduction, Electric current, Sources of electric current, Voltaic cell, Daniel cell, Dry cell, Button cell, Leclanche cell, Secondary cell, Lead acid storage battery, Electric circuit, Conductors semiconductors and insulators, Magnets, Induced magnetism, Earths magnetic field, Electromagnetic induction, Magnetic effects of electric current, Electromagnets, Electric bell, Summary
Unit 4. Sources of Energy
Introduction, Energy requirements, Development of Alternative sources of energy, Renewable Sources of Energy, Solar energy, Hydro energy, Geothermal Energy, Wind energy, Tidal energy, Energy from wood, agricultural waste and animals dung cakes, Biogas, Non-Renewable Sources of Energy, Petroleum and its products, Coal and its Products, Nuclear Fission, Nuclear fusion, Fuels, Classification of fuels as solid, liquid and gaseous fuels Solid fuel, Combustion, Types of combustion, Fire fighting, The trend of energy consumption in India, Judicious use of energy, Impact of energy consumption on environment, Earthquakes, How man alters environment, Summary
Unit 5. Sound
Introduction, Types of Sounds, Production of Sounds, Characteristics of Vibration, Characteristics of Sound, Hearing of Sound, Speed of Sound, Reflection of Sound, Uses of Sound, Noise and its Hazards, Summary
Unit 6. Friction
Introduction, Friction, Types of Friction, Advantages and Disadvantages of Friction, Definition of Force, Newton’s First Law of Motion, Newton’s Second Law of Motion, Newton’s Third Law of Motion, Summary
Unit 7. Pressure
Introduction, Thrust And Pressure, Units of Thrust, Units of Pressure, Fluid Pressure, Role of Pressure in Daily Life, Archimedes Principle, Proof of Archimedes Principle, Applications ofArchimedes Principle, Immersion of Body, Relative Density, Summary
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