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Conservation of Energy Potential Energy Kinetic Energy Energy Notes Investigative Science Lab book pages Mechanical Energy Friction Force What does Conservation of Energy mean? • Energy can flow from one object to another. • Energy cannot be created or destroyed. • It is converted from one form to another. • Energy in an isolated system is conserved. • This is also known as the first law of thermodynamics What is Heat Transfer? When thermal energy flows from a material at a higher temperature to a material at a lower temperature. What are the three mechanisms of heat transfer? 1. Conduction 2. Convection 3. Radiation What is Conduction? • Transfer of heat by the direct contact of particles of matter • Requires matter to transfer heat • Ex: – Taking a hot bath – Heat a piece of metal – holding your hands around a cup of hot cocoa. What is Convection? • Transfer of heat by the actual motion of a fluid (liquid or gas) in the form of currents. • Warmer fluids are less dense and rise. Cooler fluids are more dense and sink. • Requires matter to transfer heat • Ex: Hot water and ocean breezes What is Radiation? • Direct transfer of energy by electromagnetic waves. • Does not require matter to transfer heat • Ex: – Warmth from the Sun in the form of visible light – Infrared radiation (like your microwave) – A small amount of ultraviolet radiation What is Potential Energy? • Energy of Position • Stored energy and the energy of position gravitational energy. • Something has potential to move! What is Kinetic Energy? • Energy of Motion • A form of energy associated with the motion of a body of matter. What is Mechanical Energy? • The sum of the kinetic energy and the potential energy of a body of matter. What is Chemical Energy? • Energy stored in chemicals and energy released or absorbed in chemical reactions are called chemical energy. What is Friction? • The force exerted by a body of matter when it slides past another body of matter. • A force in the opposite direction of motion. E.g.. Rubbing hands together. Ticket out the door * Write each example * Label if it is Potential Energy, Kinetic Energy or Chemical Energy and turn in at end of class. 1. 2. 3. 4. 5. 6. 7. 8. A rock balanced at the edge of a cliff A piece of coal A landslide A roller coaster car going down a hill A diver on a ten meter platform A skateboarder rolling down a big ramp A car battery A mountain biker flying through the air after hitting a large rock 9. A cheeseburger