PPT Position And Motion


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PPT Position And Motion

  1. 1. Position and Motion
  2. 2. What is motion? <ul><li>Motion is when an object changes position. </li></ul><ul><li>How do you know that the racecar moved? </li></ul><ul><ul><li>It changed its position on the track. </li></ul></ul>
  3. 3. How can you tell something has changed position? <ul><li>In order to see if something has changed position (motion) you need a reference point. </li></ul><ul><ul><li>For example, the starting or finishing line of a racetrack. </li></ul></ul>
  4. 4. What is distance? <ul><li>Easy question! </li></ul><ul><li>Distance is how far an object has moved. </li></ul><ul><li>We measure distance in METERS! </li></ul>
  5. 5. What is displacement? <ul><li>Suppose a runner jogs north to the 50-m mark and then turns around and runs back south 30-m. </li></ul><ul><li>Total distance is 80-m. </li></ul><ul><li>Two directions - north and south. </li></ul><ul><li>Displacement is the distance and direction. </li></ul>
  6. 6. What is the difference between distance and displacement? <ul><li>Distance is how far something has moved. </li></ul><ul><li>Displacement is how far something has moved AND the direction it moved! </li></ul>
  7. 7. What is speed? <ul><li>Speed is the distance an object travels over time. </li></ul><ul><li>Any change over time is called a RATE. </li></ul><ul><li>Speed is the rate at which distance is traveled. </li></ul>
  8. 8. SPEED FORMULA <ul><li>Speed = Distance / Time </li></ul><ul><li>S = D / T </li></ul>
  9. 9. Speed Example <ul><li>Suppose you ran 2 km in 10 min. </li></ul><ul><ul><li>What is your rate? </li></ul></ul><ul><li>S = D/T </li></ul><ul><li>S= 2 km /10 min. </li></ul><ul><li>S= 0.2 km/min. </li></ul><ul><li>Remember the units!!! </li></ul>
  10. 10. Constant Speed… <ul><li>What does constant mean? </li></ul><ul><li>If you are driving on the highway and you set your cruise control, you are driving at a constant speed. </li></ul><ul><li>What would a constant speed graph look like? </li></ul>
  11. 11. Constant Speed Graph
  12. 12. Do you always go the same speed? <ul><li>No! Most of the time you are increasing speed, decreasing speed, or stopping completely! </li></ul><ul><li>Think about driving a car or riding a bike! </li></ul>
  13. 13. What would a changing speed graph look like?
  14. 14. What is average speed? <ul><li>How do you find an average? </li></ul><ul><li>Average speed is the total distance traveled over the total time </li></ul><ul><li>Avg. Speed = Total D / Total T </li></ul>
  15. 15. What is Instantaneous speed? <ul><li>What does a speedometer in a car do? </li></ul><ul><ul><li>It shows how fast a car is going at one point in time or at one instant. </li></ul></ul><ul><li>Instantaneous speed is the speed at a given point in time. </li></ul>
  16. 16. What is Velocity? <ul><li>Speed is how fast something is moving. </li></ul><ul><li>Velocity is how fast something is moving and in what direction it is moving. </li></ul><ul><li>Why is this important? </li></ul><ul><ul><li>Hurricanes </li></ul></ul><ul><ul><li>Airplanes </li></ul></ul>
  17. 17. Speed or Velocity? <ul><li>If a car is going around a racetrack, its speed may be constant (the same), but its velocity is changing because it is changing direction. </li></ul>
  18. 18. Speed or Velocity? <ul><li>Escalators have the same speed (constant), but have different velocities because they are going in different directions. </li></ul>
  19. 19. Is it moving? <ul><li>Is the earth moving right now? </li></ul><ul><ul><li>How do you know? </li></ul></ul><ul><li>How did the countries get where they are today? </li></ul><ul><ul><li>How do you know? </li></ul></ul>
  20. 20. Is it still moving? <ul><li>Are continents still moving? </li></ul><ul><ul><li>How do you know? </li></ul></ul>