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Unformatted text preview: Chapter 2: Motion along a Straight Line 2.1 Displacement, Time, and Average Velocity A useful way to describe the motion of the particle is in terms of the change in the particle's coordinate x over a time interval. Average velocity a vector quantity whose x-component is the change in x divided by the time interval Displacement: = - x x2 x1 average x-velocity the x-component of displacement, x, divided by the time interval t during which the displacement occurs - =- - = vav x x2 x1t2 t1 xt o Whenever x is positive and increasing or is negative and becoming less negative, the particle is moving in the +x-direction and - vav x is positive o Whenever x is positive and decreasing or is negative and becoming more negative, the particle is moving in the -x-direction and - vav x is negative 2.2 I nstantaneous Velocity instantaneous velocity the velocity of a particle at any specific instant of time or specific point along the path = = vx limt 0xt...
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- Spring '11