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Energy Conversions. Physical Science is the study of energy--. The following all have to do with energy: speed momentum force work power atoms and molecules density etc…. Law of Conservation of Energy. energy cannot be created nor destroyed by ordinary means
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Physical Science is the study of energy-- • The following all have to do with energy: • speed • momentum • force • work • power • atoms and molecules • density • etc….
Law of Conservation of Energy • energy cannot be created nor destroyed by ordinary means • it is just changed from one form to another • Einstein took this law farther by realizing that if matter is destroyed, energy is created and if energy is destroyed, mass is created • E=mc2 • Question-- then why bother to conserve energy?
Converting Energy • all forms of energy can be converted to other forms (mechanical, heat, chemical, electric, electromagnetic, and nuclear) • example: the chemical energy from the gas in a car changes into mechanical and heat energy as the car moves. • example: plants convert electromagnetic energy (light) to chemical energy (sugar) with photosynthesis • often KE will be converted into PE and vice-versa
PE/KE Skate Park Pendulum
Energy Conversion Example • What energy transformations must happen to light a light bulb? • mechanical energy from the water in a river moves a turbine in a dam that makes…electrical energy in the light bulb that changes to…heat energy and light energy that we can see and feel.
