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Summarize things so far…

Summarize things so far…. 10. 9. 8. What does the slope on a distance vs. time graph tell us?. Distance (m). 7. 6. What is the object’s speed from: 0-3 sec: 3-5 sec: 5-11 sec:. 5. 4. 3. 2. 1. 1 2 3 4 5 6 7 8 9 10 11. Time (sec). Distance vs. Displacement.

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Summarize things so far…

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  1. Summarize things so far… 10 9 8 What does the slope on a distance vs. time graph tell us? Distance (m) 7 6 What is the object’s speed from: 0-3 sec: 3-5 sec: 5-11 sec: 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10 11 Time (sec)

  2. Distance vs. Displacement • It is a 16 mile drive from my house to LCWM. • If I start at my house and drive to LCWM and then back to my house • What is my distance traveled? • What is my displacement? • If I start at my house and drive to LCWM • What is my distance traveled? • What is my displacement? -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 In the diagram above: What is my distance traveled? What is my displacement?

  3. Displacement is based on position • Instead of graphing distance vs. time, we can graph position vs. time • Graphing distance vs. time is fine, but it can only tell us how fast an object is going…..not which way (direction) • If we want to know how fast an object is going AND which direction it is heading, we would want a position vs. time graph • When we talk about HOW FAST and IN WHAT DIRECTION an object is going, we’re talking about its VELOCITY 5 4 3 2 1 X (m) t (sec) 1 2 3 4 5 6 7 8 9 10 -1 -2 -3 -4 -5

  4. In the previous diagram What is the object’s velocity from: 0-2 sec: 2-3 sec: 3-5 sec: 5-7 sec: 7-8 sec: 8-10 sec: 0-5 sec: 0-10 sec: What is the distance traveled from: 0-5 sec: 0-10 sec: What is the displacement from: 0-5 sec: 0-10 sec: What does the slope on a position vs. time graph tell us? What does the y-intercept on a position vs. time graph tell us?

  5. Being able to calculate speed An object travels 20 km in 100 min. What is the object’s speed in km/hr? A car going 20 mi/hr travels for 240 seconds. How far did the car travel in miles? An object travels at 30 m/s and goes a total of 200 m. How long did it take the object to travel that far in seconds? In minutes?

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