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Measured speed vs actual speed very simple

  1. Dec 7, 2004 #1
    Measured speed vs actual speed **very simple**

    If we measure the speed of a moving object with two movement detector positioned as on the atttached drawing, i.e. one is facing the movement and the other makes a slight angle with the movement, does the detector not directly in the movement line "sees" a bigger speed since if we see this as a trinangle the hypotenuse is bigger than any other side. If so how can we calculate the difference(what other info do we need?)?

    Attached Files:

  2. jcsd
  3. Dec 7, 2004 #2
    The out of line detector sees the projection of the velocity vector onto the broken line. The magnitude of the projection is less than or equal to the original vector.
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