Energy work and power web

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Energy work and power web

  1. 1. Energy Work and Power
  2. 2. Conservation of Matter <ul><li>Matter cannot be created or destroyed. </li></ul><ul><li>Atoms and particles can be rearranged. </li></ul>
  3. 3. Conservation of Energy <ul><li>Energy can never increase or decrease. </li></ul><ul><li>Energy can change from one form to another. </li></ul><ul><li>But the total amount of energy in the universe remains the same. </li></ul><ul><li>energy is that it is constantly being changed and recycled from one form to another </li></ul>
  4. 4. ENERGY AS WORK <ul><li>Energy is work or the capacity to perform work </li></ul><ul><li>Work is when a force is applied to an object so that it moves a distance. </li></ul>
  5. 5. W = Fx <ul><li>W – work – in Joules (J) </li></ul><ul><li>F – force – in Newtons (N) </li></ul><ul><li>x – distance moved – in meters (m) </li></ul>
  6. 6. KINETIC AND POTENTIAL ENERGY <ul><li>Energy of any matter in motion is termed kinetic energy. </li></ul><ul><li>Potential energy is called &quot;the energy of position.&quot; </li></ul>
  7. 7. ELECTROMAGNETISM <ul><li>every atom is held together by positive and negative electrical charges </li></ul><ul><li>a form of electromagnetic energy </li></ul><ul><li>The energy from our sun is transmitted to the Earth via electromagnetic waves </li></ul>
  8. 8. NUCLEAR ENERGY <ul><li>strong nuclear force holds the protons and neutrons together </li></ul><ul><li>at the core of the sun, atoms fuse and in the process release energy </li></ul><ul><li>process is called fusion. </li></ul>
  9. 9. NUCLEAR ENERGY <ul><li>the energy from a nuclear bomb, and from nuclear reactors released by the splitting apart of the nucleus of atoms </li></ul><ul><li>This is called fission. </li></ul>
  10. 10. CHEMICAL ENERGY <ul><li>The source of all energy for all living things is in a chemical process called photosynthesis. </li></ul><ul><li>electromagnetic waves provide the energy to convert water, and carbon dioxide from the air, into oxygen and glucose </li></ul><ul><li>Glucose is used as energy by the plant and animals that the eat the plant </li></ul><ul><li>Advantage of chemical energy is it can be stored as potential energy for long periods of time and then released as kinetic energy </li></ul>
  11. 11. SOUND ENERGY <ul><li>sound is a form of kinetic energy </li></ul><ul><li>sound energy radiates outwards, transmitted from molecule to molecule </li></ul><ul><li>Is there sound in space? </li></ul>
  12. 12. THE ENERGY OF HEAT <ul><li>Heat is a form of kinetic energy </li></ul><ul><li>rapid movement of molecules </li></ul><ul><li>As the heat of an object increases, the molecules move more and more rapidly. </li></ul>
  13. 13. ENERGY EXCHANGES <ul><li>Heat is a by-product of the mechanical or chemical processes </li></ul>
  14. 14. THE THREE LAWS OF THERMODYNAMICS <ul><li>energy cannot be created or destroyed </li></ul><ul><li>all things are moving towards equilibrium </li></ul><ul><li>as a system approaches absolute zero, the extraction of energy becomes more and more difficult </li></ul>
  15. 15. THE ENERGY-MATTER CONNECTION <ul><li>Albert Einstein </li></ul><ul><li>E = mc² </li></ul><ul><ul><li>Energy (E) equals mass, (m) times the speed of light squared (c².) </li></ul></ul><ul><li>matter can be transformed into pure energy </li></ul>
  16. 16. Video Quiz
  17. 17. <ul><li>Energy can be created and sometimes destroyed. F </li></ul><ul><li>The formula physicists use to express the expenditure of work or energy is W=Fx . </li></ul><ul><li>Kinetic energy is described as energy of matter in motion. T </li></ul><ul><li>Potential energy is not important in the total amount of energy available in the universe. F </li></ul><ul><li>Electromagnetic energy only exists as radiant energy from the sun and stars. F </li></ul>
  18. 18. <ul><li>Under intense heat two hydrogen atoms will fuse to form a helium atom and release energy. This process is called FUSION. </li></ul><ul><li>Photosynthesis is a process that converts energy from the sun into chemical energy in the leaves of plants. T </li></ul><ul><li>Energy can be changed and recycled from one form to another. T </li></ul><ul><li>The second law of thermodynamics concludes that all things are moving towards EQUILIBRIUM. </li></ul><ul><li>Einstein's formula of E = mc² states that energy equals mass times the speed of light squared. T </li></ul>

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