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

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- 1. Force & Motion
- 2. Acceleration
- 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. 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. Positive acceleration Negative acceleration
- 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. 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. 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. <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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