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Chp. 2 Forms of Energy What is energy? It is the ability to cause change. A plant uses energy from the sun Energy causes change in position Potential and Kinetic Energy What is Kinetic Energy? o Energy an object has due to its motion Kinetic Motion depends on speed depends on mass the more the mass, the more kinetic energy Potential stored energy due to interaction of objects and particles. How is all energy divided? All Energy Potential Energy Gravitation Potential Energy Kinetic Energy Motion Elastic Potential Energy Holding a book Gravitational Potential Stored between earth and book Chemical Potential Energy Elastic P Increases as stretched stored in chemical bonds released with a reaction What is Gravitational Potential Energy? Don’t look down, Rover! Good boy! o Potential energy due to an object’s position What causes greater change, dropping a bowling ball or tennis ball at 1m? the bowling ball What is Elastic Potential Energy? o Potential energy due compression or expansion of an elastic object. Notice the ball compressing and expanding What is Chemical Potential Energy? o Potential energy stored within the chemical bonds of an object o Work is the transfer of energy when a force ? makes an object move in the direction of the force. You are transferring energy right now by writing. You are applying force while the force is applied from the pencil to the paper. Forms of energy Mechanical Energy Sound Energy Thermal Energy Electric Energy Radiant Energy— Light energy Nuclear Energy chp. 2 Lesson 2 Transformations Popcorn kernel energy transformation Microwave transfer electric to radiant to thermal energy, kernals become hot Law of conservation of energy http://www.neok12. com/video/Law-ofConservation/zX0a 7f7a41717c595f78 7f0a.htm https://www.youtub e.com/watch?v=C mttxT1Wl1M pg. 50 Kinetic to potential Ball leaves the hands at its highest, energy changes from K to P Potential to Kinetic When the ball reaches the other players hand, goes from P to K from the chart on page 50, Where is the highest gravitational potential energy? balls highest point Law of conservation of energy Everyday examples how is energy transferred: when you push a book Run into your brother dog runs into the Christmas tree Friction causes transformation causes thermal energy brakes on a bike rubbing hands together drifting?? Using Energy Thermal: In a jet, burning fuel releases thermal Chemical: eating food (digesting) photosynthesis after sun absorbs radiant it turns it into chemical for food Radiant: cell phone receive it. Electric: MP3 players, hair dryers Waste energy: Thermal energy that moves into the air.