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

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Unformatted text preview: 01-1 Physics I Class 01 1D Motion Rev. 04-Jan-07 GB 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: x x x - = Time interval: t t t- = Average or mean velocity is defined as follows: t x t t x x v avg -- 01-3 Definitions (Continued) Instantaneous velocity or just velocity: t d x d t x lim v 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 = 01-4 Definitions (Continued) Average acceleration is defined as follows: t v t t v v a avg -- Instantaneous acceleration or just acceleration: 2 2 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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This note was uploaded on 04/07/2008 for the course PHYS 1200 taught by Professor Stoler during the Spring '06 term at Rensselaer Polytechnic Institute.

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

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