Page:SELECTED ESSAYS of Dr. S. S. KALBAG.pdf/154

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4. Structure of matter, molecules, atoms, protons, and electrons. 5. Physical and chemical changes. 6. States of matter; gas, liquid and solids. 7. Intensive and extensive properties; vectors and scalars. 8. Nature of living things. 9. Heredity-genes and evolution. 10. Radiation, waves and their properties, reflection-refraction. 11. Electro magnetic phenomenon. 12. Forces and strength. 13. Work energy, power. 14. Velocity and acceleration; rate. 15. Accuracy and error. 16. Field and its properties. All these concepts can be given through activity based learning and most of them make sense when given with reference to the experiences acquired in the practice of technology. 5. EXAMPLES 1. The IBM of conservation of mass and energy is one of the most fundamental laws, yet in the normal education it is hardly illustrated. First let us note that it is an extension of the conservation laws the child discovers in its growth as per the Piaget theory. Second, it gives rise to the concept of efficiency, stock inventory, and accounts etc., which are important in technology. Third, it gives the basis for mass and energy balances - the very concept of balances; this is fundamental to all technology. These are all covered in our system of science through technology application. 2. When we teach electricity, old books used to say it flows from + ve to -ve, Now we teach that electricity is a flow of electrons and Rural Development Through Education System 141