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# Ch12 speedsection1

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• The origin is at zero. If you start at the origin and move 3 meters to the right, your position is +3 meters. If you then move 5 meters to the left, your position is -2 meters. You can add each change in position to calculate your final position.
• ### Ch12 speedsection1

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. 12.1 Distance, direction, and position <ul><li>Distance is the amount of space between two points. </li></ul><ul><li>If you say you live a distance of one mile from school, you could mean anywhere on the circle of points shown. </li></ul>
4. 5. 12.1 Direction <ul><li>To find the exact location of your house, you must give both the distance and the direction from school. </li></ul><ul><li>The direction words left and right, along with up and down, are used in everyday life because they are simple to follow. </li></ul><ul><li>You could also give directions to your house using the compass directions north, south, east, and west. </li></ul>
5. 6. 12.1 Navigation <ul><li>Compass directions are printed on maps and used by ships and planes for navigation . </li></ul><ul><li>Most compasses are labeled in degrees clockwise from north. </li></ul>
6. 7. 12.1 Position <ul><li>An object’s position is its location at one instant in time. </li></ul><ul><li>A position is always given compared to a fixed point, or origin . </li></ul>
7. 8. 12.1 Position <ul><li>A number line can be used to think about position in straight-line motion. </li></ul><ul><li>What is this girl’s new position? </li></ul>
8. 9. 12.1 Position <ul><li>How you describe an object’s position depends on whether you are studying its motion in one or two dimensions. </li></ul>