Energy:Forms andChanges
Nature of Energy Energy   is all around you!   You can hear energy as sound.   You can see energy as light.   And you ...
Nature of Energy   You use energy    when you:     hit  a softball.     lift your book      bag.     compress a      s...
Nature of Energy     Living organisms need      energy for growth and            movement.
Nature of Energy   Energy is involved    when:       a bird flies.       a bomb explodes.       rain falls from the   ...
Nature of Energy   What is energy that it can be    involved in so many different    activities?      Energy can be defi...
Nature of Energy Because   of the direct  connection between energy and  work, energy is measured in  the same unit as wo...
Forms of Energy   The five main forms    of energy are:     Heat     Chemical     Electromagnetic     Nuclear     Me...
Heat Energy   The internal motion of the atoms is    called heat energy, because moving    particles produce heat.   Hea...
Chemical Energy Chemical  Energy is required to  bond atoms together. And when bonds are broken,  energy is released.
Chemical Energy Fueland food are forms of stored chemical energy.
Electromagnetic Energy   Power lines carry electromagnetic    energy into your home in the form of    electricity.
Electromagnetic Energy   Light is a form of    electromagnetic energy.   Each color of light (Roy G    Bv) represents a ...
Nuclear Energy Thenucleus of an atom is the source of nuclear energy.
Nuclear Energy   When the nucleus splits (fission),    nuclear energy is released in the    form of heat energy and light...
Nuclear Energy                 The sun’s energy                 is produced from                 a nuclear fusion         ...
Nuclear Energy Nuclear energy is the most concentrated form of energy.  Most of us live within 10 miles of the Surry  Nuc...
Mechanical Energy When work is done to an object, it acquires energy. The energy it acquires is known as mechanical energy.
Mechanical Energy When   you kick a football, you give mechancal energy to the football to make it move.
Mechanical Energy              When you throw a              balling ball, you              give it energy.              W...
Energy Conversion   Energy can be changed from one    form to another. Changes in the    form of energy are called energy...
Energy conversions   All forms of energy can be    converted into other forms.     The  sun’s energy through solar cells...
Other energy conversions   In an electric motor, electromagnetic    energy is converted to mechanical    energy.   In a ...
Energy Conversions   In an automobile    engine, fuel is    burned to convert    chemical energy    into heat energy.    ...
Chemical  Heat Mechanical
States of Energy   The most common energy    conversion is the conversion    between potential and kinetic    energy.   ...
States of Energy:Kinetic and Potential EnergyKineticEnergy is the energy of motion.Potential Energy is stored energy.
Kinetic Energy   The energy of motion is called    kinetic energy.   The faster an object moves, the    more kinetic ene...
Kinetic Energy        K.E. = mass x velocity                     2What has a greater affect of kinetic energy, mass or vel...
Potential Energy   Potential Energy is stored energy.     Stored chemically in fuel, the nucleus      of atom, and in fo...
Gravitational Potential Energy   Potential energy    that is dependent    on height is called    gravitational    potenti...
Potential Energy   Energy that is stored due to being    stretched or compressed is called    elastic potential energy.
Gravitational Potential Energy   A waterfall, a suspension bridge, and a    falling snowflake all have gravitational    p...
Gravitational Potential Energy   If you stand on a    3-meter diving    board, you have 3    times the G.P.E,    than you...
Gravitational Potential Energy   “The bigger they are the harder    they fall” is not just a saying. It’s    true. Object...
Kinetic-Potential Energy ConversionRoller coasters work because of the energy that isbuilt into the system. Initially, the...
Kinetic vs. Potential EnergyAt the point of maximum potential energy, the car hasminimum kinetic energy.
Kinetic-Potential Energy Conversions   As a basketball    player throws the    ball into the air,    various energy    co...
Ball slows down   Ball speeds up
The Law of Conservation of Energy   Energy can be neither created nor    destroyed by ordinary means.     It can only be...
Law of Conservation of Energy   In 1905, Albert Einstein said that    mass and energy can be converted    into each other...
Vocabulary Words energy mechanical energy heat energy chemical energy electromagnetic energy nuclear energy kinetic energy...
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Energy forms and_changes

  1. 1. Energy:Forms andChanges
  2. 2. Nature of Energy Energy is all around you!  You can hear energy as sound.  You can see energy as light.  And you can feel it as wind.
  3. 3. Nature of Energy You use energy when you:  hit a softball.  lift your book bag.  compress a spring.
  4. 4. Nature of Energy Living organisms need energy for growth and movement.
  5. 5. Nature of Energy Energy is involved when:  a bird flies.  a bomb explodes.  rain falls from the sky.  electricity flows in a wire.
  6. 6. Nature of Energy What is energy that it can be involved in so many different activities?  Energy can be defined as the ability to do work.  If an object or organism does work (exerts a force over a distance to move an object) the object or organism uses energy.
  7. 7. Nature of Energy Because of the direct connection between energy and work, energy is measured in the same unit as work: joules (J). In addition to using energy to do work, objects gain energy because work is being done on them.
  8. 8. Forms of Energy The five main forms of energy are:  Heat  Chemical  Electromagnetic  Nuclear  Mechanical
  9. 9. Heat Energy The internal motion of the atoms is called heat energy, because moving particles produce heat. Heat energy can be produced by friction. Heat energy causes changes in temperature and phase of any form of matter.
  10. 10. Chemical Energy Chemical Energy is required to bond atoms together. And when bonds are broken, energy is released.
  11. 11. Chemical Energy Fueland food are forms of stored chemical energy.
  12. 12. Electromagnetic Energy Power lines carry electromagnetic energy into your home in the form of electricity.
  13. 13. Electromagnetic Energy Light is a form of electromagnetic energy. Each color of light (Roy G Bv) represents a different amount of electromagnetic energy. Electromagnetic Energy is also carried by X-rays, radio waves, and laser light.
  14. 14. Nuclear Energy Thenucleus of an atom is the source of nuclear energy.
  15. 15. Nuclear Energy When the nucleus splits (fission), nuclear energy is released in the form of heat energy and light energy. Nuclear energy is also released when nuclei collide at high speeds and join (fuse).
  16. 16. Nuclear Energy The sun’s energy is produced from a nuclear fusion reaction in which hydrogen nuclei fuse to form helium nuclei.
  17. 17. Nuclear Energy Nuclear energy is the most concentrated form of energy. Most of us live within 10 miles of the Surry Nuclear Power Plant which converts nuclear energy into electromagnetic energy.
  18. 18. Mechanical Energy When work is done to an object, it acquires energy. The energy it acquires is known as mechanical energy.
  19. 19. Mechanical Energy When you kick a football, you give mechancal energy to the football to make it move.
  20. 20. Mechanical Energy When you throw a balling ball, you give it energy. When that bowling ball hits the pins, some of the energy is transferred to the pins (transfer of momentum).
  21. 21. Energy Conversion Energy can be changed from one form to another. Changes in the form of energy are called energy conversions.
  22. 22. Energy conversions All forms of energy can be converted into other forms.  The sun’s energy through solar cells can be converted directly into electricity.  Green plants convert the sun’s energy (electromagnetic) into starches and sugars (chemical energy).
  23. 23. Other energy conversions  In an electric motor, electromagnetic energy is converted to mechanical energy.  In a battery, chemical energy is converted into electromagnetic energy.  The mechanical energy of a waterfall is converted to electrical energy in a generator.
  24. 24. Energy Conversions In an automobile engine, fuel is burned to convert chemical energy into heat energy. The heat energy is then changed into mechanical energy.
  25. 25. Chemical  Heat Mechanical
  26. 26. States of Energy The most common energy conversion is the conversion between potential and kinetic energy. All forms of energy can be in either of two states:  Potential  Kinetic
  27. 27. States of Energy:Kinetic and Potential EnergyKineticEnergy is the energy of motion.Potential Energy is stored energy.
  28. 28. Kinetic Energy The energy of motion is called kinetic energy. The faster an object moves, the more kinetic energy it has. The greater the mass of a moving object, the more kinetic energy it has. Kinetic energy depends on both mass and velocity.
  29. 29. Kinetic Energy K.E. = mass x velocity 2What has a greater affect of kinetic energy, mass or velocity? Why?
  30. 30. Potential Energy Potential Energy is stored energy.  Stored chemically in fuel, the nucleus of atom, and in foods.  Or stored because of the work done on it:  Stretching a rubber band.  Winding a watch.  Pulling back on a bow’s arrow.  Lifting a brick high in the air.
  31. 31. Gravitational Potential Energy Potential energy that is dependent on height is called gravitational potential energy.
  32. 32. Potential Energy Energy that is stored due to being stretched or compressed is called elastic potential energy.
  33. 33. Gravitational Potential Energy A waterfall, a suspension bridge, and a falling snowflake all have gravitational potential energy.
  34. 34. Gravitational Potential Energy If you stand on a 3-meter diving board, you have 3 times the G.P.E, than you had on a 1-meter diving board.
  35. 35. Gravitational Potential Energy “The bigger they are the harder they fall” is not just a saying. It’s true. Objects with more mass have greater G.P.E. The formula to find G.P.E. is G.P.E. = Weight X Height.
  36. 36. Kinetic-Potential Energy ConversionRoller coasters work because of the energy that isbuilt into the system. Initially, the cars are pulledmechanically up the tallest hill, giving them a greatdeal of potential energy. From that point, theconversion between potential and kinetic energypowers the cars throughout the entire ride.
  37. 37. Kinetic vs. Potential EnergyAt the point of maximum potential energy, the car hasminimum kinetic energy.
  38. 38. Kinetic-Potential Energy Conversions As a basketball player throws the ball into the air, various energy conversions take place.
  39. 39. Ball slows down Ball speeds up
  40. 40. The Law of Conservation of Energy Energy can be neither created nor destroyed by ordinary means.  It can only be converted from one form to another.  If energy seems to disappear, then scientists look for it – leading to many important discoveries.
  41. 41. Law of Conservation of Energy In 1905, Albert Einstein said that mass and energy can be converted into each other. He showed that if matter is destroyed, energy is created, and if energy is destroyed mass is created. 2  E = MC
  42. 42. Vocabulary Words energy mechanical energy heat energy chemical energy electromagnetic energy nuclear energy kinetic energy potential energy gravitational potential energy energy conversion Law of Conservation of Energy

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