ساينس الصف الأول الاعدادي – الفصل الدراسي الاول ساينس اولي اعدادي ترم اول In This part we will study : 2. Resources and forms of energy Resources of the Energy: 1. Permanent sources of energy (sun only) 2. Renewable sources of energy. (Wind, Waterfalls, Tide and ebb) 3. Non-renewable Sources of energy. • The fuel (oil, Coal, natural gas) • The food (chemical reactions) • Nuclear Reactions (The reactions in the nucleus of the atom) Forms of energy 1. Mechanical Energy: (P.E + K.E) the energy stored in stretched spring. 2. Electric Energy: The energy produced from an electric generator. 3. Sound Energy: The energy produced by music player. 4. Light Energy: The energy produced by from the light bulb or the candle. 5. Chemical Energy: The energy stored in the car battery or the food. 6. Heat Energy: The energy produced from the heater or the stove. 7. Nuclear Energy: The energy produced from the nucleus of the atom. The mechanical energy It is the sum of potential and kinetic energies of the body. Mechanical energy = Potential energy + Kinetic energy Problem: Calculate the mechanical energy of a moving body whose potential energy is 2000 joules and its kinetic energy is 100 joules. Solution The mechanical energy = potential energy + kinetic energy = 2000 + 100 = 2100 joules لمتابعة مستر احمد الباشا وكل ما يخص الساينس : جروب الفيس بوك http://bit.ly/2Of1mcN صفحة الفيس بوك http://bit.ly/2Gq5xMo بالتوفيق مستر احمد الباشا