188宝金博页面版

LAB?#1?‐?Distance?–?Time?Graphs?LAB??One?of?the?most?effective?methods?of?describing?motion?is?to?plot?graphs?of?distance,?velocity,?and?acceleration?vs.?time.?From?such?a?graphical?representation,?it?is?possible?to?determine?in?what?direction?an?object?is?going,?how?fast?it?is?moving,?how?far?it?traveled,?and?whether?it?is?speeding?up?or?slowing?down.?In?this?experiment,?you?will?use?a?Motion?Detector?to?determine?this?information?by?plotting?a?real?time?graph?of?your?motion?as?you?move?across?the?classroom.??The?Motion?Detector?measures?the?time?it?takes?for?a?high?frequency?sound?pulse?to?travel?from?the?detector?to?an?object?and?back.?Using?this?round‐trip?time?and?the?speed?of?sound,?you?can?determine?the?distance?to?the?object;?that?is,?its?position.?Logger?Pro?will?perform?this?calculation?for?you.?It?can?then?use?the?change?in?position?to?calculate?the?object’s?velocity?and?acceleration.?All?of?this?information?can?be?displayed?either?as?a?table?or?a?graph.?A?qualitative?analysis?of?the?graphs?of?your?motion?will?help?you?develop?an?understanding?of?the?concepts?of?kinematics.???Purpose??• Analyze?the?motion?of?a?student?walking?across?the?room.?• Predict,?sketch,?and?test?distance?vs.?time?kinematics?graphs.?• Predict,?sketch,?and?test?velocity?vs.?time?kinematics?graphs.???PART?1??1. PREDICTIONS:?Use?the?graph?grids?on?the?attached?page?to?sketch?the?distance?vs.?time?graph?that?demonstrates?each?of?the?following?situations:??A. you?are?at?rest?at?a?position?of?1?m?from?the?motion?detector?B. walking?with?a?slow,?constant?speed??C. walking?with?a?fast,?constant?pace?D. walking?so?that?you?are?speeding?up?as?you?go?E. walking?quickly?at?the?start,?then?get?slower?and?slower?F. walking?slowly?at?first,?stop?for?at?least?2?seconds,?then?walking?quickly?G. walk?quickly?for?the?first?5?seconds,?turn?around?and?return,?walking?slowly?for?the?last?5?seconds?H. start?at?the?2?m?position,?walking?slowly?for?5?seconds,?turn?around?and?walking?back?quickly?for?the?last?5?seconds???2. TEST?#1:?Now,?use?the?motion?detector?to?test?your?predictions.?(Instructions?are?placed?at?each?station).?Then?I?will?come?and?“sign”?your?observation?sheet,?to?show?that?your?graph?is?correct.??ANALYSIS OF DISTANCE VS. TIME GRAPH 1. Explain the significance of the slope of a distance vs. time graph. Include a discussion of positive and negative slope. 2. What type of motion is occurring when the slope of a distance vs. time graph is zero? 3. What type of motion is occurring when the slope of a distance vs. time graph is constant? 4. What type of motion is occurring when the slope of a distance vs. time graph is changing? Test your answer to this question using the Motion Detector.