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Motion

Motion. Motion diagrams?A series of images of a moving object that records its position after equal time intervals.At restSpeeding upSlowing downConstant speedLink to Motion Diagram AppletLink to Another Motion Diagram Site. The Particle Model. Replace an object with a single point at the ce

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Motion

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    1. Motion Position—separation of an object from a fixed reference point. Is a vector measurement. += to the right or up - = to the left or down Distance—requires no reference point. Is a scalar measurement. Instantaneous position Displacement—change in position. Symbolized as delta d.

    2. Motion Motion diagrams—A series of images of a moving object that records its position after equal time intervals. At rest Speeding up Slowing down Constant speed Link to Motion Diagram Applet Link to Another Motion Diagram Site

    3. The Particle Model Replace an object with a single point at the center of the body. You can use this model effectively if: The size of the object is much less than the distance it moves. Internal motions can be ignored.

    4. Coordinate System What is your frame of reference? Where is zero? Origin—zero point. You need to keep horizontal and vertical displacements on separate axes. Position/displacement vectors on a motion diagram. Can there be a negative position? Can there be a negative time?

    5. Velocity Average velocity=displacement/time + = to the right or up - = to the left or down Velocity vs. Speed Position-time graph Slope=average velocity Instantaneous velocity=slope of the tangent line to the point in question.

    6. Position Time Graph

    7. Acceleration a=change in velocity over change in time Units Positive or negative—What do these signs mean? Deceleration Average Acceleration

    8. Acceleration Velocity vs. Time graph Slope=average acceleration Slope of the tangent line to the graph=instantaneous acceleration. Area under the curve=the total displacement. Velocity/Time Graph Applet Velocity/Time, Position/Time, and Acceleration/Time graph applets Instantaneous Acceleration Uniform or Constant Acceleration Link to PHET Moving Man Simulation Equations Acceleration due to gravity

    9. Velocity Time Graph

    10. Acceleration Due to Gravity Lowercase g -9.8 meters per second squared -32 feet per second squared Sample Problems

    11. Acceleration Equations vf=vI + at Vf2=vi2 + 2ad d=vit +1/2 at2 d=1/2(vf + vi)t

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