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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 Superposition of forces Newton’s III Law Types of Forces Weight is Gravitational Force `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 1 2 3 ... = net i F F F F F Σ = + + + G G 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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