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# lec01 - Physics I Class 01 1D Motion Rev 04-Jan-07 GB 01-1...

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01-1 Physics I Class 01 1D Motion Rev. 04-Jan-07 GB

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01-2 Definitions Scalar: A number – positive, negative, or 0. Magnitude: Absolute value – positive or 0. Vector: Magnitude (or length) and direction in space. Time: t (scalar) Position: x (vector) Displacement: 0 x x x - = Time interval: 0 t t t - = Average or mean velocity is defined as follows: t x t t x x v 0 0 avg - -
01-3 Definitions (Continued) Instantaneous velocity or just “velocity”: t d x d t x lim v 0 t Example: When you take a car trip, you get the magnitude of avg v by dividing the change in the odometer (or distance) by the hours you drove. You get many values of v during the trip by checking the speedometer moment by moment. If v is constant: v v avg =

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01-4 Definitions (Continued) Average acceleration is defined as follows: t v t t v v a 0 0 avg - - Instantaneous acceleration or just “acceleration”: 2 2 0 t t d x d t d v d t v lim a
01-5 Definitions (Continued) Beware: The English word “acceleration” does not have the same meaning as the physics word. In physics, any change in the velocity vector is an acceleration!

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