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Unformatted text preview: velocity is along a line that is tangent to the path of the par8cle and in the direc8on of mo8on • SI unit: meter per second (m/s) Accelera8on • The average accelera8on is deﬁned as the rate at which the velocity changes • The instantaneous accelera8on is the limit of the average accelera8on as Δt approaches zero • SI unit: meter per second squared (m/s²) Accelera8on due to change in velocity • The magnitude of the velocity (the speed) may change with 8me • The direc8on of the velocity may change with 8me, even if the magnitude is constant example: circular mo8on • Both the magnitude and the direc8on may change with 8me Projec8le Mo8on Projec8le Mo8on • Mo8on in two dimensions under the force of gravity • Ignoring the air fric8on and the rota8on of the earth, the projec8le path is a parabola. Projec8le Mo8on • The x and y direc8ons of mo8on are completely independent of each other • The x direc8on is uniform mo8on – ax = 0 • The y direc8on is free fall – ay =  g • T...
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This document was uploaded on 01/14/2014.
 Winter '14

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