Review notes

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Review notes

  1. 1. PHYSICS REVIEW <ul><li>Summary of concepts </li></ul><ul><li>Revision activity: Find someone who… </li></ul><ul><li>Individual work: review worksheets </li></ul>
  2. 2. BIG IDEAS <ul><li>Energy cannot be created nor destroyed . Energy is converted from one form to another. </li></ul><ul><li>An object that has energy can do work . </li></ul><ul><li>Work is done when energy is transferred from one object to another or changed from one form to another. </li></ul>
  3. 3. Image source: http://www.greenearthproject.com/Forms2.html
  4. 4. <ul><li>SUMMARY OF CONCEPTS: </li></ul><ul><li>If h is doubled , the GPE is doubled . </li></ul><ul><li>If h is tripled , the GPE is also tripled . </li></ul><ul><li>If speed (velocity) is doubled (2x), the Kinetic Energy increases ( 4x or 2 2 ). </li></ul><ul><li>If speed (velocity) is tripled (3X ), the KE increases 9x or 3 2 . </li></ul><ul><li>The GPE at the top changes to KE at the bottom . </li></ul>GPE = w x h or GPE = mgh
  5. 5. <ul><li>1. PE = KE </li></ul><ul><li>2. Work = Energy </li></ul><ul><li>Work = PE gained = KE </li></ul><ul><li>Work = KE </li></ul>WORK AND ENERGY
  6. 6. <ul><li>POTENTIAL ENERGY </li></ul><ul><li>Energy is stored , ready to act </li></ul><ul><li>e.g. Gravitational PE, Elastic PE </li></ul><ul><li>GPE = mass x gravity x height </li></ul><ul><li>weight x height </li></ul><ul><li>Force x distance = Work </li></ul><ul><li>GPE = gravitational potential energy (J) </li></ul><ul><li>m = mass (kg) g = gravity 10 (m/s/s) </li></ul><ul><li>h = height (m) </li></ul><ul><li>KINETIC ENERGY </li></ul><ul><li>Energy due to movement </li></ul><ul><li>e.g. Heat, Sound, Light, Mechanical </li></ul><ul><li>Kinetic Energy = 1/2 the product of </li></ul><ul><li>the mass times the square of the velocity </li></ul><ul><li>KE = mv 2 /2 </li></ul><ul><li>KE = kinetic energy (J) </li></ul><ul><li>m = mass (kg) </li></ul><ul><li>v = velocity (speed) (m/s) </li></ul><ul><li>WORK </li></ul><ul><li>Force exerted on an object making it </li></ul><ul><li>move through a distance </li></ul><ul><li>occurs with energy transfer </li></ul><ul><li>Work = Force x distance W = F x d </li></ul><ul><li>W = work (J) </li></ul><ul><li>F = force (N) </li></ul><ul><li>d = distance (m) </li></ul>

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