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The Nature of Energy

Energy. Every change that occurs involves .Moving objects have energyYou can tell an object has energy when it: Changes its environmentChanges itselfEnergyElectrical moving electronsChemical from bondsThermal- heat. Energy. Energy exists in many different formsIt may look different,

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The Nature of Energy

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    1. The Nature of Energy Section 4.1

    2. Energy Every change that occurs involves . Moving objects have energy You can tell an object has energy when it: Changes its environment Changes itself Energy Electrical – moving electrons Chemical – from bonds Thermal- heat

    3. Energy Energy exists in many different forms It may look different, but it’s still energy. Examples: fire, movement, gasoline in a bucket Kinetic energy- energy in the form of motion Depends on mass and velocity of an object Increase in either mass or velocity = increase in energy KE =1/2 mv2 Units = kg*m/s

    4. Types of Energy KE = ½ mv2 Velocity changes will impact KE more because velocity is squared. Potential Energy – energy of position Energy in stationary objects and bonds Elastic Potential Energy – Energy of compression or stretching Chemical Potential Energy – Energy stored in bonds Gasoline, food, hand warmers

    5. Types of Energy Gravitational Potential Energy- Energy stored due to position above the surface of Earth Depends on mass of object, height of object above ground, and acceleration due to gravity GPE = m x h x a All energy – measured in units of Joules 1 J = 1 kgm2/ s2 Energy can be converted: As an object falls, GPE decreases and KE increases

    6. Our energy use and it’s effects http://www.teachersdomain.org/resources/tdc02/sci/life/eco/energyuse/index.html

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