Lecture_2

Lecture_2 - P123 Lecture2 11Sept2010 1DimensionalMotion...

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P123 Lecture 2 11 Sept 2010 1 Dimensional Motion Review : Displacemen : = • Displacement : x = x 2 - x 1 Average velocity (Vector If x < 0 then x 1 “to the right” of x 2 ) x x 1 2 • Average velocity : (Not the same as average speed) t x t t av x v 1 2 slope = v av x diagram x 1 x 2 v x ( t 2 ) v x ( t 2 ) > v x ( t 1 ) x-t diagram: x = x ( t ) Instantaneous velocity dt dx t x x v 0 lim v x ( t ) 1 • Instantaneous velocity : v x ( t ) is slope of tangent to x - t plot at time t . t
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i-Clicker Question How many beans are in the 900 ml beaker? A. Fewer than 1000 B. 1000-1500 C.1500-2000 D.2000-2500 E. More than 2500 2
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Consider x-t plot on last slide: v x ( t 1 ) < v x ( t 2 ) v x is not constant in time v x = v x ( t ) acceleration • acceleration : time rate of change of velocity • average acceleration: • instantaneous acceleration: t v t t v v av x x x x a 1 2 1 2 d dv v x x a lim 2 2 dt x d dt dv a (slope of line tangent to v x ( t ) at time t ) dt t t x 0 In v-t plot above, v x ( t ) is a line constant acceleration i.e.: v x ( t ) = [const] t dv x /dt =
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This note was uploaded on 03/14/2011 for the course P 123 taught by Professor Stevens during the Spring '11 term at Rust.

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Lecture_2 - P123 Lecture2 11Sept2010 1DimensionalMotion...

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