2'3 Acceleration

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2.3 Acceleration

• Unit 1 Chapter 2
• CPO Science
• Courtney Lewis
• Stapley Junior High School

2
Acceleration

• Change in Speed/Change in Time
• How much is your speed changing/how much time
  passed
• Increases as you go downhill, the steeper the
  hill, the greater the acceleration

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Units of Acceleration

• English
• Miles per hour mph/s
• Metric
• (cm/s)/s
• (m/s)/s

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Examples of Acceleration

• Acceleration can be increasing () or
  decreasing (-)
• Deceleration decreasing speed over time
• Zero acceleration speed is constant, like
  cruise control
• Free fall greatest acceleration, no other force
  interfering with gravity

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Acceleration on a Graph

• Acceleration is the SLOPE of a Speed vs. Time
  Graph
• Slopes
• Positive Increasing change in speed
• Negative Decreasing change in speed
• Zero Slope/Flat No change in speed

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Calculating Acceleration from Graph

• Draw a right triangle to find the slope OR
• Pick two points, find the difference in the ys
  and divide it by the difference in the xs

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Homework

• Assignment 2.2 p. 39 Vocab Sets 2 3, Concept
  Review 612, Problems 513
• DUE Thursday, May 3, 2007