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Bellringer 8/30 

Learn the difference between speed and velocity, and how to measure and document the position and motion of objects. Explore acceleration - increasing or decreasing speed, and changing direction.

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Bellringer 8/30 

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  1. Bellringer 8/30  • What is the difference between speed and velocity?

  2. Today’s Target… • I can use observations and appropriate tools to document the position and motion of objects. This means I can make observations about how an object’s motion changes.

  3. Acceleration

  4. REVIEW • What is motion? • How do we know an object is in motion? • How do we measure motion? • What is the difference between speed and velocity? • How do we find speed?

  5. Acceleration • Consider this: a car is stopped at a red light, when the light changes the driver gently steps on the accelerator and the car speeds up or accelerates • In everyday language acceleration means “the process of speeding up”

  6. Acceleration • Acceleration is the rate at which velocity changes • Remember that velocity is speed and direction • Acceleration is • increasing speed • decreasing speed • changing direction

  7. Increasing Speed • Any time the speed of an object increases it experiences acceleration • What are some examples of acceleration? • A car that moves from a stopped position • Runners taking off

  8. Decreasing Speed • Decreasing speed is also acceleration • Called negative acceleration or deceleration • What are some examples of deceleration? • A ball rolling to a stop • A car coming to a red light • An airplane landing

  9. Changing Direction • Remember that velocity involves both speed and DIRECTION, so a change in direction is also acceleration • You may think that a car traveling at constant speed does not accelerate, but actually it does because it will change directions!

  10. Changing Direction • Examples: • Race car drivers rounding a turn • Any circular motion • The seats on a Ferris wheel

  11. Did you get it? • How is it possible for a car to be accelerating if its speed is steady at 65 mph?

  12. Determining Acceleration

  13. Determining Acceleration

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