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4 UNIT 2. Mechanical Engineering ……….…………………………………….31 2.1. Simple Machines……………………………………………………………32 2.2. Screws……………………………………………………………………….33 2.3. Levers……………………………………………………………………….34 2.4. Gears………………………………………………………………………...35 2.5. Pulleys………………………………………………………………………36 2.6. Wheel and Axle……………………………………………………………..37 2.7. What is Motion? ............................................................................................38 2.8. What is Force? ...............................................................................................39 2.9. Dynamics……………………………………………………………………40 2.10. What is energy? ...........................................................................................41 2.11. Types of Energy…………………………………………………………...42 2.12. Change of state…………………………………………………………….43 2.13. Density……………………………………………………………………..44 2.14. Kinetic Theory……………………………………………………………..45 2.15. Blaise Pascal (1623-62)……………………………………………………46 2.16. Pressure…………………………………………………………………….47 2.17. Liquids……………………………………………………………………..48 2.18. Gases……………………………………………………………………….49 2.19. What is Heat? ..............................................................................................50 2.20. James Prescott Joule (1818-89)……………………………………………51 UNIT 3. Electrical Engineering ………..…………………………………....52 3.1. What is Electricity? ......................................................................................53 3.2. Making Electricity…………………………………………………………..54 3.3. Static Electricity…………………………………………………………….55 3.4. Magnets……………………………………………………………………..56 3.5. Electromagnetism…………………………………………………………...57 3.6. Electric Circuits……………………………………………………………..58 3.7. Waves……………………………………………………………………….59