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# Ch12 speedsection3

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### Ch12 speedsection3

1. 2. Motion and Force <ul><li>Chapter Twelve: Distance, Time, and Speed </li></ul><ul><li>Chapter Thirteen: Forces </li></ul><ul><li>Chapter Fourteen: Force and Motion </li></ul>
2. 3. Chapter Twelve: Distance, Time, and Speed <ul><li>12.1 Distance, Direction, and Position </li></ul><ul><li>12.2 Speed </li></ul><ul><li>12.3 Graphs of Motion </li></ul>
3. 4. 12.3 Graphs of Motion <ul><li>A position vs. time graph that is a straight line always means the object moves the same distance during each time period. </li></ul>
4. 5. 12.3 Graphs of Motion <ul><li>You can use position vs. time graphs to compare the motion of different objects. </li></ul><ul><li>The steeper line on a position vs. time graph means a faster speed. </li></ul>
5. 6. 12.3 Slope <ul><li>The steepness of a line is measured by finding its slope. </li></ul><ul><li>The slope of a line is the ratio of the “rise” to the “run” </li></ul>
6. 9. 12.3 Graphs of changing motion <ul><li>Objects rarely move at the same speed for a long period of time. </li></ul><ul><li>A speed vs. time graph is also useful for showing the motion of an object that is speeding up </li></ul><ul><li>or slowing down. </li></ul>
7. 10. Technology Connection <ul><li>That first roller coaster was all wood and ran in a straight line. </li></ul><ul><li>Roller coasters are now made of wood or steel, and the tracks include a variety of twists and turns and loops and drops that make the ride scary and thrilling. </li></ul>Roller Coasters: The Physics Behind the Thrill
8. 11. Investigation 12B <ul><li>How do we describe motion for which the speed is not constant? </li></ul>Motion with Changing Speed