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11 1 Distance And Displacement
 

11 1 Distance And Displacement

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    11 1 Distance And Displacement 11 1 Distance And Displacement Presentation Transcript

    • Chapter 11 Motion 11.1 Distance and Displacement
    • 11.1 Frame of Reference
      • = Is a system of objects that are not moving with respect to another object. 
      • = Needed to describe motion completely and accurately
      • **Students Describe where something is in the room without using a frame of reference**
    • Relative Motion —
      • Movement in relation to a frame of reference
      • Ex. People on a train seem to not be moving when looking at each other
      • People on platform waiting for the train will say the train is moving fast
      • Choosing a meaningful frame of reference allows you to describe motion in a clear and relevant manner.
    • Displacement Vs. Distance
      • Distance = is the length of path between two Points
      • Displacement = the direction and the length of a straight line from the starting point to the ending point. Measured in metric
      A B
    • Vector
      • Vector = has a magnitude and a direction
      • = Can be size, length, or amounts
      • = Arrows on a map
      • = Size of arrows shows magnitude
      • = Vectors can be combined
    • Vector
      • Vectors will show: Actual Movement
      • How far you actually went
      • Vectors will show: Displacement
      • How far from the start point you are
    • Combined Vectors:
      • Vectors in the same direction can be added  
      • 3cm + 5 cm = 8cm
      • Vectors in opposite direction can be subtracted  
      • 7cm – 2cm = 5cm
    • Displacement That Isn’t Along a Straight Path
      • Two or more displacement vectors have different directions…they may be combined by graphing
      • Similar to drawing a map with direction to school from your home.
      • How many miles exact path or how many miles as straight as the arrow flies?