# 44 - Racquetball Striking a Wall Copyright Loren M Winters...

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Physics 140: Winter 2012 Lecture #2 Jan 10, 2012 Dr. Dave Winn Racquetball Striking a Wall Copyright: Loren M. Winters My Office Hours (1416 Randall Lab) Monday 1pm-3pm Tuesday 1pm-3pm

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Q2.2 This is the x-t graph of the motion of a particle. Of the four points P, Q, R, and S , the speed is greatest at A. point P. B. point Q. C. point R. D. point S. E. not enough information in the graph to decide
Q2.3 This is the x-t graph of the motion of a particle. Of the four points P, Q, R, and S , the acceleration a x is greatest (most positive) at A. point P. B. point Q. C. point R. D. point S. E. not enough information in the graph to decide

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Kinematics: a description of motion • “The science of pure motion, considered without reference to the matter or objects moved, or to the force producing or changing the motion.” In French: “cinematique”… • Start simply – Point object – One dimensional motion, back and forth along a line… • Note position “s i ” at every instant “t i ”: this describes the motion 0 2 4 -2 -4
Positions at various times • Positions s i are not distances, but locations at instants t i • Displacements s 12 = s 2 – s 1 • Intervals t 12 = t 2 – t 1 • Often represent this in a „position-time‟ graph s t Records position s at every instant t, and provides a visualization of the motion

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What do we need to describe? • The whole story is there in the path s(t): complete description • To explain this motion, we need to think about both how fast it moves, and especially about how that motion changes Moving slow Moving fast Speeding up Slowing down Moving slow s t
A physics student starts (t=0) at the library in the illustration, lingers there for a moment, and then walks along to the gym, and stays there for a moment. She then runs quickly to the Arb, and then

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44 - Racquetball Striking a Wall Copyright Loren M Winters...

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