Lecture2 - Definition Average Velocity (Speed) s average =...

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Unformatted text preview: Definition Average Velocity (Speed) s average = average speed = (distance / time interval) = d / t scalar v average = Average velocity = (displacement / time interval) = r / t vector Distance, d = 2 R Displacement , r = 0 Example : t =10 sec R = 2m R s = 12 m / 10 sec = 1.2 m/s s = d/ t v = r/ t v = Relating position to velocity v av = r / t r and v always same direction r v r = v av t s av = d / t d = s av t Convention: sign of position and velocity Position x > 0 x x x < 0 Velocity v x > 0 Direction of motion v x < 0 Direction of motion Definition Average Acceleration a average = average acceleration = (change velocity / time interval) a av = v / t a av v same direction as NOT v Does | v | = cost imply a = 0 ? NO Example | v 1 | | v 2 | | v 1 | = | v 2 | same magnitude but opposite direction v = v = a av t Remember: Velocity is a VECTOR! a = 0 IF : Change magnitude and/or Change direction a and v have same direction only in one dimension Convention: sign of acceleration (1D) a x > 0 Acceleration vector point to the right...
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This note was uploaded on 04/03/2008 for the course PHYSICS 7A taught by Professor Lanzara during the Spring '08 term at University of California, Berkeley.

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Lecture2 - Definition Average Velocity (Speed) s average =...

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