bell ringer 25 june 2009. lt: interpret a distance-time graph to properly describe the motion of an...
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Bell Ringer
25 June 2009
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• LT: Interpret a distance-time graph to properly describe the motion of an object.
• Discuss with your team how the motion of an object can be described with a graph.
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Describe tumble buggy motion
• Define the system - What must we include; what may we disregard?
• Define the variables - What aspects are likely to change in our description of the motion?
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Making a distance-time graph
• Start your stopwatch when car passes the starting line.
• Every 5 seconds place a washer beside the tumble buggy’s position (distance measured from the starting line).
• Record distance and time, and make a d-t graph.
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Interpreting a dist-time graph
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Best-fit Line for Tumble Buggy
• Determine expected model of best-fit line (e.g., proportional, linear, inverse).
• Determine if line must pass through origin.• Fit line so that it minimizes the sum of all vertical
deviations (residuals) from that line.
Correct Fit Minimize Residuals
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Interpreting Slopes
• To find slope, identify two points on best-fit line.
• Identify one point’s coordinates as (xP, yP) and the other point’s coordi-nates as (xR, yR).
• Calculate slope = change in y divided by change in x.
• Slopes can be + (a and b), - (c and d), 0 (horizontal), or infinite (vertical).