2c_lec3

2c_lec3 - Today: Objects in free fall. The vector...

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Unformatted text preview: Today: Objects in free fall. The vector description of motion. Relative Motion. Physics 2A Olga Dudko UCSD Physics Lecture 3 Superman #204 (vol. 2, April 2004) by Jim Lee and Scott Williams Objects in free fall x Objects in free fall = a t m a x h e i g h t v o = ?? v 2 = v 2 + 2 a x x = v t + 1 2 at 2 x = 1 2 ( v + v ) t v = v + at v 2 = v 2 + 2 a x = v 2 2 a x v = 2 a x => => v = 2 ( 9 . 80 m s 2 )( 201 m ) = 62 . 8 m s This is the initial velocity that Superman needs to attain maximum height. Note: even though acceleration a < 0, the constant g is always >0. Motion in more than one dimension Vectors ? ? time, mass, energy Vector notations When handwriting - an arrow over it: Printed - boldface type: The magnitude of the vector - in italics or with the vector in the middle of absolute value lines: A A A A A Length of the arrow = magnitude of the vector quantity Orientation of the arrow = vectors direction Adding vectors When adding two vectors: make sure you take their directions into account; the units must be the same. Perform the addition geometrically or algebraically. Geometrically: vectors are placed head-to-tail: (resultant) A B B A + A B Adding multiple vectors Vector addition is commutative: When adding multiple vectors, just keep repeating the process until you have included all of the vectors....
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This note was uploaded on 04/15/2011 for the course PHYS 2c taught by Professor Wurthmeir during the Spring '05 term at UCSD.

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2c_lec3 - Today: Objects in free fall. The vector...

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