Energy: Forms and Changes
What is energy? <ul><li>The ability to do work </li></ul>
Nature of Energy <ul><li>Energy is all around you! </li></ul><ul><ul><li>You can hear energy as sound. </li></ul></ul><ul>...
Nature of Energy <ul><li>You use energy when you: </li></ul><ul><ul><li>hit a softball. </li></ul></ul><ul><ul><li>lift yo...
Nature of Energy <ul><li>Living organisms need energy for growth and movement. </li></ul>
Nature of Energy <ul><li>Energy is involved when: </li></ul><ul><ul><li>a bird flies. </li></ul></ul><ul><ul><li>a bomb ex...
Nature of Energy <ul><li>Because of the direct connection between energy and work, energy is measured in the same unit as ...
Other forms of Energy <ul><li>Some forms of energy are: </li></ul><ul><ul><li>Mechanical </li></ul></ul><ul><ul><li>Therma...
Thermal Energy <ul><li>The internal motion of the atoms is called heat energy, because moving particles produce heat. </li...
Chemical Energy <ul><li>Chemical Energy is required to bond atoms together. </li></ul><ul><li>And when bonds are broken, e...
Chemical Energy <ul><li>Fuel and food are forms of stored chemical energy . </li></ul>
Electrical Energy <ul><li>Power lines carry electric energy into your home in the form of electricity. </li></ul>
Electrical Energy <ul><li>It is the energy of moving electrons. </li></ul><ul><li>It is used in your home and comes from p...
Sound energy <ul><li>It is the energy caused by an object’s vibrations. </li></ul><ul><li>When you stretch a guitar string...
Light energy <ul><li>Light energy is produced by the vibrations of electrically charged particles. </li></ul><ul><li>Like ...
Nuclear Energy <ul><li>The nucleus of an atom is the source of nuclear energy.  </li></ul>
Nuclear Energy <ul><li>When the nucleus splits (fission), nuclear energy is released in the form of heat energy and light ...
Nuclear Energy <ul><li>Nuclear energy is the most concentrated form of energy. </li></ul>Most of us live within 10 miles o...
Mechanical Energy <ul><li>When work is done to an object, it acquires energy. The energy it acquires is known as mechanica...
Mechanical Energy <ul><li>When you kick a football, you give mechancal energy to the football to make it move. </li></ul>
Energy Conversion <ul><li>Energy can be changed from one form to another. Changes in the form of energy are called energy ...
States of Energy:  Kinetic and Potential Energy <ul><li>Kinetic Energy is the energy of motion. </li></ul><ul><li>Potentia...
Kinetic Energy <ul><li>The energy of motion is called kinetic energy. </li></ul><ul><li>The faster an object moves, the mo...
Potential Energy <ul><li>Potential Energy is stored energy. </li></ul><ul><ul><li>Stored chemically in fuel, the nucleus o...
Gravitational Potential Energy <ul><li>Potential energy that is dependent on height is called gravitational potential ener...
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Energy

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  • What is energy? The ability to do work
  • You need to remember that energy is all around you. You can hear energy as sound You can see energy as light You can feel it as wind
  • You use energy when you: hit a softball. lift your book bag.
  • Living organisms need energy for growth and movement
  • Energy is involved when: a bird flies. a bomb explodes. rain falls from the sky.
  • Some forms of energy are: Mechanical Thermal Chemical Electrical Sound Light Nuclear
  • 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.
  • Chemical Energy Chemical Energy is required to bond atoms together. And when bonds are broken, energy is released.
  • Fuel and food are forms of stored chemical energy .
  • Electromagnetic energy Power lines carry electromagnetic energy into your home in the form of electricity.
  • Light is a form of electromagnetic energy. Each color of light represents a different amount of electromagnetic energy. Electromagnetic Energy is also carried by X-rays, radio waves, and laser light.
  • Light is a form of electromagnetic energy. Each color of light represents a different amount of electromagnetic energy. Electromagnetic Energy is also carried by X-rays, radio waves, and laser light.
  • Light is a form of electromagnetic energy. Each color of light represents a different amount of electromagnetic energy. Electromagnetic Energy is also carried by X-rays, radio waves, and laser light.
  • Nuclear energy The nucleus 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 energy. Nuclear energy is also released when nuclei collide at high speeds and join (fuse).
  • Nuclear energy is the most concentrated form of energy.
  • 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.
  • States of energy Kinetic and potential energy Kinetic Energy is the energy of motion. Potential Energy is stored 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. Mv2 ___ 2
  • 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:
  • GRAVITATIONAL POTENTIAL ENERGY Potential energy that is dependent on height is called gravitational potential energy.
  • Energy

    1. 1. Energy: Forms and Changes
    2. 2. What is energy? <ul><li>The ability to do work </li></ul>
    3. 3. Nature of Energy <ul><li>Energy is all around you! </li></ul><ul><ul><li>You can hear energy as sound. </li></ul></ul><ul><ul><li>You can see energy as light. </li></ul></ul><ul><ul><li>And you can feel it as wind. </li></ul></ul>
    4. 4. Nature of Energy <ul><li>You use energy when you: </li></ul><ul><ul><li>hit a softball. </li></ul></ul><ul><ul><li>lift your book bag. </li></ul></ul><ul><ul><li>compress a spring. </li></ul></ul>
    5. 5. Nature of Energy <ul><li>Living organisms need energy for growth and movement. </li></ul>
    6. 6. Nature of Energy <ul><li>Energy is involved when: </li></ul><ul><ul><li>a bird flies. </li></ul></ul><ul><ul><li>a bomb explodes. </li></ul></ul><ul><ul><li>rain falls from the sky. </li></ul></ul><ul><ul><li>electricity flows in a wire. </li></ul></ul>
    7. 7. Nature of Energy <ul><li>Because of the direct connection between energy and work, energy is measured in the same unit as work: joules (J). </li></ul><ul><li>In addition to using energy to do work, objects gain energy because work is being done on them. </li></ul>
    8. 8. Other forms of Energy <ul><li>Some forms of energy are: </li></ul><ul><ul><li>Mechanical </li></ul></ul><ul><ul><li>Thermal </li></ul></ul><ul><ul><li>Chemical </li></ul></ul><ul><ul><li>Electrical </li></ul></ul><ul><ul><li>Sound </li></ul></ul><ul><ul><li>Light </li></ul></ul><ul><ul><li>Nuclear </li></ul></ul>
    9. 9. Thermal Energy <ul><li>The internal motion of the atoms is called heat energy, because moving particles produce heat. </li></ul><ul><li>Heat energy can be produced by friction. </li></ul><ul><li>Heat energy causes changes in temperature and phase of any form of matter. </li></ul>
    10. 10. Chemical Energy <ul><li>Chemical Energy is required to bond atoms together. </li></ul><ul><li>And when bonds are broken, energy is released. </li></ul>
    11. 11. Chemical Energy <ul><li>Fuel and food are forms of stored chemical energy . </li></ul>
    12. 12. Electrical Energy <ul><li>Power lines carry electric energy into your home in the form of electricity. </li></ul>
    13. 13. Electrical Energy <ul><li>It is the energy of moving electrons. </li></ul><ul><li>It is used in your home and comes from power plants. </li></ul>
    14. 14. Sound energy <ul><li>It is the energy caused by an object’s vibrations. </li></ul><ul><li>When you stretch a guitar string, the string stores potential energy. </li></ul><ul><li>The string transmits some kinetic energy to the air around it. </li></ul>
    15. 15. Light energy <ul><li>Light energy is produced by the vibrations of electrically charged particles. </li></ul><ul><li>Like sound vibrations, light vibrations cause energy to be transmitted. </li></ul>
    16. 16. Nuclear Energy <ul><li>The nucleus of an atom is the source of nuclear energy. </li></ul>
    17. 17. Nuclear Energy <ul><li>When the nucleus splits (fission), nuclear energy is released in the form of heat energy and light energy. </li></ul><ul><li>Nuclear energy is also released when nuclei collide at high speeds and join (fuse). </li></ul>
    18. 18. Nuclear Energy <ul><li>Nuclear energy is the most concentrated form of energy. </li></ul>Most of us live within 10 miles of the Surry Nuclear Power Plant which converts nuclear energy into electromagnetic energy.
    19. 19. Mechanical Energy <ul><li>When work is done to an object, it acquires energy. The energy it acquires is known as mechanical energy. </li></ul>
    20. 20. Mechanical Energy <ul><li>When you kick a football, you give mechancal energy to the football to make it move. </li></ul>
    21. 21. Energy Conversion <ul><li>Energy can be changed from one form to another. Changes in the form of energy are called energy conversions. </li></ul>
    22. 22. States of Energy: Kinetic and Potential Energy <ul><li>Kinetic Energy is the energy of motion. </li></ul><ul><li>Potential Energy is stored energy . </li></ul>
    23. 23. Kinetic Energy <ul><li>The energy of motion is called kinetic energy. </li></ul><ul><li>The faster an object moves, the more kinetic energy it has. </li></ul><ul><li>The greater the mass of a moving object, the more kinetic energy it has. </li></ul><ul><li>Kinetic energy depends on both mass and velocity. </li></ul>
    24. 24. Potential Energy <ul><li>Potential Energy is stored energy. </li></ul><ul><ul><li>Stored chemically in fuel, the nucleus of atom, and in foods. </li></ul></ul><ul><ul><li>Or stored because of the work done on it: </li></ul></ul><ul><ul><ul><li>Stretching a rubber band. </li></ul></ul></ul><ul><ul><ul><li>Winding a watch. </li></ul></ul></ul><ul><ul><ul><li>Pulling back on a bow’s arrow. </li></ul></ul></ul><ul><ul><ul><li>Lifting a brick high in the air. </li></ul></ul></ul>
    25. 25. Gravitational Potential Energy <ul><li>Potential energy that is dependent on height is called gravitational potential energy. </li></ul>

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