# Lect_03 - ACT: Cross product Vectors A, B and C are on the...

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Lecture 3 1D motion ACT: Cross product Vectors A, B and C are on the plane of the screen. They are drawn to scale. Compare the magnitude of these two cross products: A. | A × B | > | A × C | B. | A × B | = | A × C | C. | A × B | < | A × C | A B C B sin θ cos And they both point out of the screen. | A × B | = AB sin = AC =| A × C | The cross product selects the part of that is perpendicular to the direction of A . An overview of Mechanics Mechanics: study of the motion of objects. 1. Kinematics : How do things move? 2. Dynamics : Why do things move? 4. Some special cases: •Rigid body motion •Simple harmonic motion •Gravitational forces, Hooke’s law… 3. Conservation laws : •Work-energy •Momentum (linear and angular) For some problems, the math is easier to handle with The Simplest Case: 1D Motion along a Straight Line Position: A single + or – number (coordinate) describes the location of an object relative to a reference point (origin ). Description of motion : position x as a function of time t : An equation x(t) A graph A table of data Time (t) Position (x) A A B B E E D D , C C

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## This note was uploaded on 04/16/2008 for the course PHYSICS 221 taught by Professor Johnson during the Fall '06 term at Iowa State.

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Lect_03 - ACT: Cross product Vectors A, B and C are on the...

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