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Chapter 5 Energy and Energy Resources

Chapter 5 Energy and Energy Resources. Section 1 What is Energy? Section 2 Energy Conversions Section 3 Conservation of Energy Section 4 Energy Resources. Section 1 What is Energy. Right. Energy and Work: Working Together Energy is the ability to do work Kinetic Energy

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Chapter 5 Energy and Energy Resources

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  1. Chapter 5Energy and Energy Resources Section 1 What is Energy? Section 2 Energy Conversions Section 3 Conservation of Energy Section 4 Energy Resources

  2. Section 1 What is Energy Right • Energy and Work: Working Together • Energy is the ability to do work • Kinetic Energy • The energy of motion Kinetic energy = mv2 2 • Example: • What is the kinetic energy of a car with a mass of 3000 kg traveling at 30 m/s?

  3. Right • Potential Energy • Energy an object has because of position • Gravitational Potential Energy (GPE) • The energy of an object’s mass and height above the ground • GPE is at a maximum at the top • If you are on a trampoline, your GPE is at a max at the top of your jump GPE = weight x height • Example Problem • What is the GPE of a 640 N diver standing on a platform 4 m high?

  4. Right • Mechanical Energy • The total energy of motion and position of an object • Juggling a pin • A baseball falling through the air Mechanical energy = potential energy+ kinetic energy • Example problem • A pin being juggled has a potential energy of 20 J and a kinetic energy of 600 J, what is the pin’s mechanical energy?

  5. Other Energy Forms Right • Thermal • Due to random motion of particles • Any time an energy conversion occurs, some of the original energy converts to thermal, Ex: A hairdryer • Chemical • Comes from a compound that changes as its atoms are rearranged, Ex: Energy in food • Electrical • Energy of moving electrons, Ex: An amplifier and microphone • Sound • Caused by an objects vibrations, Ex: stretch a guitar string • Light • Produced by the vibrations of electrically charged particles • Nuclear • The energy that comes from the nucleus of an atom

  6. Mini Book Construction Left • Title: • Chapter 5 Energy and Energy Resources • On the tabs: • Types of Energy • Energy Conversions • Conservation of Energy • Energy Resources

  7. Cut, Paste and Identify each energy type Left

  8. Section 2: Energy Conversions Right • Energy Conversion • Change from one form of energy to the other • Elastic Potential Energy • The type of energy a rubber band has when you wind it on a toy airplane • The energy you put into stretching the rubber band

  9. Energy Conversions Left

  10. Mini Book Construction • Tab: Energy Conversions • Define energy conversion, pg. 132 • Define Elastic potential energy • Give 2 examples of each: • Conversions in Chemical Energy, pg 133 • Conversions in Electrical Energy • What is the role of energy conversions in Machines? Give an example machine that converts and what does it do? (pg 137)

  11. Section 3: Conservation of Energy Right • The Law of Conservation of Energy • After energy conversions, you end up with the same total amount of energy as the original amount of potential energy • Energy before = Energy after

  12. Section 3: Conservation of Energy Left

  13. Section 3: Conservation of Energy Left

  14. Mini Book Construction • Tab: Conservation of Energy, page 138 • ____ is a force that opposes motion between two surfaces that are in contact. • The law of conservation of energy states that …. • Give 2 examples of how thermal energy is always a result of energy conversion. • Perpetual motion is impossible because ….

  15. Section 4: Energy Resources Right • Nonrenewable resources cannot be replaced or are replaced more slowly than they are used up • Fossil Fuels: oil, natural gas, coal; formed by the buried remains of plants and animals from millions of years ago

  16. Everyday uses of Some Fossil Fuels Right • The US primary source of electrical energy is generated by burning fossil fuels • Fossil fuels are energy resources from buried remains of plants and animals that lived millions of years ago. • Fossil Fuels contain stored energy from the sun. • Concentrated forms of the sun’s energy

  17. Section 4: Energy Resources Left

  18. Converting Fossil Fuels into Electrical Energy Left • An electric generator converts energy of one type into another - Electric Company - Electricity petroleum

  19. Mini Book Construction • Tab: Energy Resources, page • Create a table – Advantages and Disadvantages of Energy Resources (list one of each, Fossil Fuel-Biomass) Non Renewable Resources Renewable Resources Ex. 1 Ex. 2 Ex. 3 Ex. 1 Ex. 2 Ex. 3

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