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PHY231 lecture2

# PHY231 lecture2 - Physic 231 Lecture 2 Main points of...

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Main points of today’s lecture Physic 231 Lecture 2 0 x v; t t t t xv t 0 0 for constant acceleration: a a; assuming also t 0 vv a t t0 x vl i m t v a; v a t o 2 0 1 v t 2 1 t a t t v al i m t 22 0 2 2 a x

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(mi) Suppose the man walks at a rate of 3 mi/hr from Park Lane to Hagadorn and enslowsto15mi/hrfrom agadorn Collingwood Then what is his x (mi) -1 0 1 2 then slows to 1.5 mi/hr from Hagadorn to Collingwood. Then what is his average velocity? a) -2 mi/hr b) 2 mi/hr c) -2.25 mi/hr d) 2.25 mi/hr
Graphical determination of velocity 1 To determine velocity at any point, just compute the slope.

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Graphical determination of velocity 2 To determine instantaneous velocity at any point, just compute the slope of ngent line You can do this by making ever smaller triangles: tangent line. You can do this by making ever smaller triangles: x v lim s m m / 2 . 5 26 t t 0 s 5
Exercise A particle moves with the position vs. time graph shown. Which graph best illustrates the velocity of the particle as a function of time?

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Clicker question asses P and Q move with the position graphs shown Do P and Q Masses P and Q move with the position graphs shown. Do P and Q
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PHY231 lecture2 - Physic 231 Lecture 2 Main points of...

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