2'2 Position

1
2.2 Position Time

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

2
Position and Distance

• Position How far you are from your starting
  point in a given direction
• Distance How far you have traveled total with
  no reference to direction
• Ex position for a round trip to a destination
  45 km away is 0, but distance is 90 km

3
Position vs Time

• Position is the Dependent Variable (y-axis)
• Time is the Independent Variable (x-axis)
• Slopes
• Positiveposition is increasing, moving away from
  start
• FlatPosition is constant, unchanging
• Negativeposition is decreasing, moving toward
  start

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Position vs. Time Cont
What is the position of the car after 45 min?
What is the position of the car after 2 hours?
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Speed Slope

• The slope of a line on a position vs. time graph
  is the SPEED (distance/time)
• Sloperise/run

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Instantaneous and Average Speed

• Speed is not constant
• Ex. Driving on surface streets w/stop lights
• Average speed total distance/total time
• Instantaneous speed distance/time in a specific
  moment
• Ex. Stopped at a stop light speed is 0
• Ex. Going uphill speed is slower
• Ex. Going downhill speed is faster

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Instantaneous and Average Speed cont.

• Instantaneous Speed can also be figured from a
  graph

Calculate the Instantaneous Speed at points A, B,
C, and D using the graph
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HOMEWORK

• Assignment 2.1 p. 39 Vocabulary Set 1, Concept
  Review 15, Problems 14
• DUE Tuesday, May 1, 2007