Lecture 9

Lecture 9 - Today Physics 231 General University Physics...

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Physics 231 General University Physics Spring 2007 Lecture 9 Today ± Force as a Vector ² Superposition of forces ± Newton’s III Law ± Types of Forces ² Weight is Gravitational Force ² `Contact’ Forces Force is a Vector ± Demo: tennis ball and basketball ± Discussion: Projectile Motion Trajectory a vs v ± Acceleration is a Vector and Newton’ II Law implies that Force is a Vector Superposition of Forces ± Reminder: additive property of forces Superposition of Forces ± Forces are vectors ± Forces add ± Forces add as vectors 123 ... = net i FF F F F Σ =+ + + GG G G G Newton’s Second Law ± a= Σ F / m ± When viewed from an inertial frame, the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass ± Force is the cause of change in motion, as measured by the acceleration (the effect)
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Motion from Force ± Identify all forces on an object ± Add all forces as vectors and get ± Determine the object’s acceleration ± Determine the subsequent motion from kinematic equations 123 ... = net i FF F F F Σ =+ + + GG G G G / net aF m = G G Quiz: Three forces act on an object. In which direction does it accelerate? (a) (b) (c) (d) (e ) 20% 40% 0% 0% 40% 1. (a) 2. (b) 3. (c) 4.
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This note was uploaded on 11/16/2010 for the course PHY 231 taught by Professor Ellis during the Spring '08 term at Kentucky.

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Lecture 9 - Today Physics 231 General University Physics...

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