Physics : Class VIII
Force and Pressure
- Idea of Force : A push or a pull
- Force and Motion – Change in State of Motion
- Force – Interaction of Forces and Change in Shape due to Force
- Contact Force – Friction, Applied Force and Normal Force
- Non-Contact Force – Gravitational Force, Electrostatic Force and Magnetic Force
- The Concept of Pressure
- Hydro-static Pressure – Pressure Exerted by Fluids
- Atmospheric Pressure – Hydro-static Pressure exerted by Gases
Friction
- Friction – factors affecting friction
- Sliding and rolling friction
- Kinetic Friction
- Advantages and disadvantages of friction for the movement of automobiles
- Airplanes and boats/ships : Fluid Friction
- Friction and Frictional Force – A Necessary Evil
Sound
- Sound produced by vibrating bodies
- Sound produced by humans
- Medium of Propagation
- How do we hear sound ?
- Amplitude, Time Period, And Frequence of a vibration
- Loudness and Pitch
- Audible and in audible sound
- Difference between noise and music
- Noise pollution and its preventive measures
Chemical Effects of Electric Current
- Electric Current
- Conduction of Electricity: Do Liquids Conduct Electricity?
- Conduction of Electricity in Liquids – Electrolysis
- Electrolysis and Electroplating
Some Natural Phenomena
- Lightning
- Charging by rubbing
- Transfer of Charge
- The Story of Lightning
- Lightning Safety
- Phenomena related to earthquakes
- Protection against earthquakes
Light
- Reflection of Light – The Laws of Reflection
- Characteristics of image formed with a plane mirror
- Reflection of Light – Regular Reflection, Diffused Reflection and Multiple Reflection
- Sunlight – white or colored ?
- Structure of the eye
- Non-Optical Low Vision Aids – Devices to Help the Blind and the Visually Impaired
- Optical Low Vision Aids – Devices to Help the Blind and the Visually Impaired
- Braille – Helping the Blind and the visually impaired read
Stars And The Solar System
- Celestial Bodies
- Moon
- Stars
- Planet
- Constellations
- Motion of celestial objects in space
- The Solar System
- Other Members of the Solar System
Synthetic Fibres and Plastics
- Synthetic fibers
- Plastics and other synthetic materials
- Usefulness of plastics
- Disadvantages of plastics
- Fibrous materials in use
Materials: Metals & Non-Metals
- Metals : Physical and Chemical Properties and Uses
- Non-Metals : Physical and Chemical Properties and Uses
Coal and Petroleum
- Coal and its story
- Natural Resources : Inexhaustible and exhaustible natural resources
- Useful products obtained from coal
- Formation of coal and petroleum in nature
- Petroleum and refining of petroleum
- Natural Gas
- Natural resources are limited
- Consequences of over extraction of coal and petroleum
Combustion and Flame
- Combustion and types of combustion
- Flame
- Fire Control
- Fuels : Types of fuels
- Heat released from fuels
- Fuel efficiency and cost
- Effects of burning fossil fuels
Pollution of Air and Water
- Agrochemicals and their effects
- Air Pollution and Effects of Air Pollution – Acid Rain and Taj Mahal
- Greenhouse effect
- How to reduce air pollution?
- Water pollution
- Potable water
- How to reduce water pollution
Crop Production and Management
- Agricultural practices
- Preparation of soil
- Sowing
- Irrigation
- Protection form weed
- Harvesting and shortage
- Food from animals
Microorganisms: Friend and Foe
- Microorganisms
- Microorganism and us: Friendly microorganisms
- Disease causing microorganisms
- Food preservation
- Nitrogen fixation
- Nitrogen Cycle
Cell – Structure and Function
- Discovery of cell
- Organism show variety in cell number, shape and size
- Cell structure and function, Parts of cell: cell membrane, cytoplasm
- Nucleus, vacuole and chloroplast
- Comparison of plant and animal cell
Reproduction in Animals
- Modes of reproduction
- Sexual reproduction: male and female reproductive organs
- Internal and external fertilization, development of embryo
- Viviparous and oviparous organisms, young ones to adults
- Asexual reproduction
Reaching the Age of Adolescence
- Adolescence and puberty: Secondary sexual characteristics
- Role of hormones in initializing reproductive functions
- Reproductive phase in humans
- How is the sex of baby determined
- Hormones other than sex hormones
- Role of hormones in completing the life history of insects and frogs
- Reproductive Health