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U2 Wiki1 09

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Transcript

  • 1.  
  • 2.
    • Measures the distance form a starting point to an end point
    • Displacement = Xf-Xi (Final position minus Initial position)
    • Displacement doesn’t care how the object got from Xi to Xf, it only cares about the distance between the two points.
      • Not path dependent
      • Running in a circle or finishing a trip from its start results in a displacement of 0 (Xi and Xf are the same Xf-Xi=0)
    • Measured in meters
    • Displacement is displayed as a number line:
  • 3.
    • Negatives and positives in displacement represent direction.
    • If Xi is greater than Xf then the displacement is negative
    • A negative displacement usually means the object was going backwards.
    • This depends of the frame of reference
  • 4.
    • A frame of reference can make calculating a displacement or distance much easier.
    • A frame of references tells you where zero is and which direction is positive
    • You can usually choose your frame of reference. Making Xi or Xf 0 makes calculations easier.
  • 5.
    • Distance is like displacement, but it is path dependent.
    • It not only wants to know the distance between Xi and Xf, but also how the object got there.
    • Distance, unlike displacement, CANNOT be negative, it is physically impossible.
    • Measured in meters
  • 6.
    • The amount of time the object takes to get from Xi to Xf
    • Ti – Tf
    • Always positive
    • Ti is almost always 0
    • Measured in seconds
  • 7.
    • Velocity = Displacement over Time .
    • Can be negative. The sign represents direction.
    • Measured in meters over seconds.
  • 8.
    • Speed = Distance over Time
    • Cannot be negative
    • Measured in meters over seconds
  • 9.
    • Slope = Velocity
  • 10.
    • Measures the velocity in a single instant
    • Easy on graphs with straight line
    • Slightly harder on curves.
      • Solution = take the slope of a tangent line
  • 11.
    • Acceleration = Velocity over Time
    • Can be negative
  • 12.
    • Slope = Acceleration
    To find the instantaneous acceleration, draw a tangent line and measure the slope Y T