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Understanding Acceleration in Physics

Learn about acceleration - the rate at which velocity changes, with examples like cars speeding up, slowing down, and roller coasters. Discover the formula, units, and how to calculate acceleration in various scenarios.

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Understanding Acceleration in Physics

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  1. Velocity Explain why we say all 3 cars are changing their velocity

  2. Sometimes we are interested in how fast the velocity of an object is changing • How fast is the car speeding up that is trying to pass me on the 2 lane road to Lubbock? • How fast did I slow down to avoid hitting the dog in the road? • How fast did the roller coaster go around the curve? b/c I am feeling sick!

  3. Acceleration

  4. Acceleration Definition: the rate at which velocity is changing It can be a change in 1) velocity and/or 2) direction Formula: Acceleration= velocity final – velocity initial time Unit: 10 m/s or m/s² s

  5. Something to remember • A positive value for acceleration shows speeding up • and negative value for acceleration shows slowing down • The correct terms are positive and negative acceleration

  6. Let’s try a few for physics fun A softball player increases her velocity from 2.0 m/s to 10.0 m/s in 3.0 seconds. What is her acceleration?

  7. Problem #1 Looking for • Acceleration Given • Velocityinitial = 2.0 m/s • Velocityfinal = 10.0 m/s • Time = 3 seconds Relationship

  8. Problem #2 A car accelerates at a rate of 3.0 m/s2. If its original speed is 8.0 m/s, how many seconds will it take the car to reach a final speed of 25.0 m/s?

  9. Problem #2 Looking for • Time Given • Velocitylinitial = 8.0 m/s; Velocityfinal = 25.0 m/s • Acceleration = 3.0 m/s2 Relationship

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