P2 Chapter 1 Revision

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1.1 Distance - time Graphs

  • The slope on a distance time graph represents speed.
  • The steeper the line on a distance - time graph, the greater the speed
  • speed (m/s) = distance travelled (m)/ time taken (s)

                                 Speed formula triangle (http://dspace.jorum.ac.uk/xmlui/bitstream/handle/10949/1004/Items/T175_8_025i.jpg)

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1.2 Velocity and Acceleration

  • Velocity is speed in a given direction.
  • Velocity is sometimes a more useful measure of motion, because it describes both speed and direction.
  • The acceleration of an object is its change of velocity per second.
  • Acceleration is measured in metres pre second squared.
  • Acceleration = change in velocity (m/s)/ time taken for change (s)
  • A body travelling at a steady speed is accelerating if its direction is changing.
  • We use the term negative deceleration in any situation where an object slows down.
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1.3 More about Velocity-time Graphs

  • The slope of the line on a velocity-time graoh represents acceleration.
  • Braking reduces the velocity of a vehicle.
  • The area under any section of the graph is equal to the displacement (distance) travelled in that time interval.
  • The area under the line on a velocity-time graph represents distance travelled.
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1.4 Using Graphs

  • For an object moving at a constant speed, the distance-time graph is a straight line.
  • For a moving object with a changing speed, the distance-time graph is not a straight line.
  • The slope on a velocity-time graph represents acceleration.
  • To find the distance travelled from the graph, remember the area under a velocity-time graph represents the distance travelled.
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