chapter2.1-2.3_slides

# chapter2.1-2.3_slides - 9/8/2009 Chapter 2. Motion in One...

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9/8/2009 1 Chapter 2. Motion in One Dimension Mechanics: Study of motion - Kinematics: Description of motion without concerning its cause - Dynamics: Study the cause of motion and the consequences Galileo: Quantitative study of motion, based on experiment !

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9/8/2009 2 Chapter 2: Motion in one dimension Chapter 3: Motion in two dimension Important Concepts/quantities: - Displacement, Velocity, Acceleration All three quantities are VECTORS - have both a magnitude and a direction - By contrast, a SCALAR quantity has only a magnitude (could be positive or negative) - A vector is usually denoted by an arrow over the top of a symbol - For one dimensional motions, + / - signs are sufficient - We will discuss more on vectors later , , , ., . a v r g e Motion <-> change in position Displacement : Change in position Initial position: Final position: Displacement: final - initial Need a frame of reference, a choice of coordinate system (coordinate axes and origin) i x i f x x x f x The Greek letter (delta) is usually used to denote a change in quantities.
9/8/2009 3 Another example: m 30 i x m 53 f x m 22 30 52 i f x x x Direction: positive x direction m 38 i x m 91 38 ) 53 ( i f x x x Direction: Negative x direction m 52 f x Position vs. time Position as a function of time 0 t s 10 s 20 s 30 s 40 s 50

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9/8/2009 4 Velocity is a vector whereas speed is a scalar Why does it matter? Direction!
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## This note was uploaded on 01/02/2010 for the course PHY 101 taught by Professor Pralle during the Spring '08 term at SUNY Buffalo.

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chapter2.1-2.3_slides - 9/8/2009 Chapter 2. Motion in One...

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