Acceleration By Hamdy Karim

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To My Dear Students of G.8C in KFS, KSA, Riyadh. Mr. Hamdy Karim.

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Acceleration By Hamdy Karim

  1. 1. Force & Motion
  2. 2. Acceleration
  3. 3. Change in Velocity <ul><li>Each time you take a step you are changing the velocity of your body. </li></ul><ul><li>You are probably most familiar with the velocity changes of a moving bus or car. </li></ul><ul><li>The rate at which velocity (speed with direction) changes occur is called acceleration. </li></ul>
  4. 4. Speed 0 2 1 3 Meters/second Acceleration how quickly velocity changes over time. <ul><li>Acceleration= </li></ul><ul><li>final velocity- starting velocity </li></ul><ul><li>time </li></ul><ul><li>Change in velocity = </li></ul><ul><li>final – starting velocity velocity </li></ul><ul><li>Acceleration = change in velocity </li></ul><ul><li> time </li></ul>
  5. 5. Positive acceleration Negative acceleration
  6. 6. Which of the following is certain to change as a ball accelerates? mass of the ball inertia of the ball velocity of the ball force acting on the ball
  7. 7. What must happen to an object in order to accelerate it? A net force must be applied. Some weight must be removed. Its frictional coefficient must be reduced. It must contain momentum.
  8. 8. Which of these describes the object with the largest acceleration ? An object with a small change in velocity over a small change in time An object with a small change in velocity over a large change in time An object with a large change in velocity over a small change in time An object with a large change in velocity over a large change in time
  9. 9. <ul><li>Scalar </li></ul><ul><li>a measurement that does </li></ul><ul><li>NOT contain direction . </li></ul><ul><li>E.g sample: Speed </li></ul><ul><li>Vector </li></ul><ul><li>a measurement that contains direction . </li></ul><ul><li>E.g sample: Velocity </li></ul>

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