Download Understanding Motion from Distance-Time Graphs and more Lecture notes Physics in PDF only on Docsity! Distance vs. Time Analysis of a Distance vs. Time Graph What can the motion on a Distance (d) vs. Time (t) Graph Where did the object start? Which direction did it go? Where did the object stop? Is the motion uniform (constant)? Is the motion non-uniform (changing)? Can you tell which is faster? (if 2 or more objects are present) The slope of a line on a distance-time graph is speed The steeper the slope, the faster you are traveling The flatter the slope, the slower you are traveling Graphing Motion Not moving? This is what it looks like… If something is not moving, a horizontal line is drawn in a distance-time graph Time is increasing to the right, but its distance does not change. It is stationary. Moving…. If something is moving at a steady speed, it means we expect the same increase in distance in a given time: Time is increasing to the right, and distance is increasing steadily with time. It moves at a steady speed. Example #1 Each line (A and B) represent the motion of two objects. Which object is moving faster? Explain. Graphing Motion Example #2 Which car has a faster speed: The big car or small car? Explain Graphing Motion Example #3 Using this graph, what is the average speed of the Big Car and the average speed of the small car? Graphing Motion =< 1000
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Rise=? 3 hours 600 m Speed = Slope = Rise/ Rise/ What is the speed of the airplane? Different Slopes 0 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 Time (hr) D is ta n c e ( k m ) Run = 1 hr Run = 1 hr Run = 1 hr Rise = 0 km Rise = 2 km Rise = 1 km Slope = Rise/Run = 1 km/1 hr = 1 km/hr Slope = Rise/Run = 0 km/1 hr = 0 km/hr Slope = Rise/Run = 2 km/1 hr = 2 km/hr Here is another time-distance graph with 2 journeys represented on the same graph. Each line represents a journey from home to the office. The red line is Dave’s journey. The green line is Mike’s journey. 1000 m 500 m 0 5 10 15 D i s t a n c e Time (min) How long after Dave does Mike leave? 3 min After how many minutes does Mike catch up? 7 min How far from home are they then? Dave: 71.66 m/min Mike: 100 m/min What is the speed of each person? 500 m 1500 m Question #4 What is going on in each section of the following distance-time graph? 3.5 Assessment Questions 3.5 Homework • Graphing “Little Dudes I” • Graphing “Little Dudes II” • Little Dots in Uniform Motion
