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Position, Velocity and Acceleration 9/10/13

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Bellwork What is the variable and unit for acceleration? Variable is “a” Unit is “meters per second per second” abb. (m/s) ——— (s)

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Agenda Check off homework Bellwork Position, velocity and acceleration notes Best fit curve lines Finish the lab Retakes tomorrow or Thurs. Conference Period

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QuantityVariable used in equations Unit (How it is measured) Abb. for the unit Displacement / Distance dmetersm Timetsecondss Massmkilogramkg Velocity / Speed vmeters per second m/s Accelerationa meters per second per second m/s/s or m/s 2 ForceFNewtonN

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Notes about the Formula Cards Please put your name and period number on the formula card Can use the formula card on tests, quizzes and the final Only the information that is given can be put on the formula card, NO other notes

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Magnitude, Scalar and Vector Magnitude: The amount or measurement of a quantity. Scalar: A physical quantity that has magnitude but no direction. Vector: A physical quantity that has both magnitude and direction.

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Position and Location: Where is the object is located? Distance: (scalar) the amount of space between two points Displacement: (vector) the distance in a given direction

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Velocity: How long does it takes the object to move a distance? Speed (scalar): The rate at which an object changes its distance. Velocity (vector): The speed of an object with direction.

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Acceleration: Is the object speeding up, slowing down or turning? Acceleration (vector): The rate at which an object changes its velocity. Ways to accelerate: Speeding up (gas pedal) Slowing down (break pedal) Turning (steering wheel)

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Initial, Final, Change of, Average, and Instantaneous Velocities v int – initial velocity v fin – final velocity Δv – Change of velocity v ave – Average velocity Instantaneous velocity (concept only) Constant velocity

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Initial, Final, Change of, Average, and Instantaneous Velocities Initial velocity is the starting velocity (often times will be zero) Final velocity is the end velocity Change of velocity the difference between initial and final velocities

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Constant Velocity Constant velocity: Where the initial and final velocities are same, Equals the average velocity, and NO Acceleration

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Initial, Final, Change of, Average, and Instantaneous Velocities Average velocity is your velocity over a period of time (overall displacement and total time) Instantaneous velocity is how fast you are going at that moment (speedometer at that moment)

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Acceleration… Is how many meter per second an object is changing each second (m/s) ——— (s)

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Constant Velocity vs. Acceleration YouTube Videos http://www.youtube.com/watch?v=L8JGXB cSPiw http://www.youtube.com/watch?v=L8JGXB cSPiw http://www.youtube.com/watch?v=DRb5P SxJerM http://www.youtube.com/watch?v=DRb5P SxJerM

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Summary These notes cover textbook pages 10-16

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