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Work And Energy


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Work And Energy

  1. 1. Colegio San Patricio Physics WORK AND ENERGY Mrs. Nora Guerra Mrs. Martha Fuentes
  2. 2. Work <ul><li>Work is done whenever a force (F) is exerted and whenever there is a displacement (s). </li></ul><ul><li>The amount of work done is proportional to both, the force and displacement. </li></ul><ul><li>(W=F*s) </li></ul><ul><li>Work is measured in newton-meters or Joules. </li></ul>
  3. 3. Formula for work W F d W= work F= force d= distance
  4. 4. Energy <ul><li>Ability to do work </li></ul><ul><li>No energy: no work </li></ul><ul><li>Measured in Joules. </li></ul>
  5. 5. Energy Examples <ul><li>Energy: </li></ul><ul><li>In a raindrop: .0001 Joules </li></ul><ul><li>Needed to press a key: .01 Joules </li></ul>
  6. 6. Kinetic enegy <ul><li>It´s the energy of motion. </li></ul><ul><li>An object with motion- whether it´s vertical or horizontal- has kinetic energy. </li></ul>
  7. 7. Kinetic energy formula <ul><li>Kinetic energy equals the massof the moving object times the square of that object´s velocity, multiplied times the constant ½. </li></ul><ul><li>KE= 1/2 mv ² </li></ul>
  8. 8. Potential energy <ul><li>It´s the energy that can result in the exertion of a force over a distance. It is stored energy. </li></ul><ul><li>Most common= Gravitational PE </li></ul>
  9. 9. Potential energy formula <ul><li>Potential energy (joules) = </li></ul><ul><li>mass (kg)*g(m/s 2)* height (m). </li></ul>