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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 doesnâ€™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 â€“ 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