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Unit 1 Physics. Graphing Speed. d vs. t graphs. Graph the motion use the slope to interpret the relationship between the variables (d & t). ΔY. rise. d. =. =. =. =. Slope. Speed. run. ΔX. t. *steeper the slope . faster the speed. *more gentle the slope . slower the speed.
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Unit 1 Physics Graphing Speed
d vs. t graphs • Graph the motion • use the slope to interpret the relationship between the variables (d & t) ΔY rise d = = = = Slope Speed run ΔX t *steeper the slope faster the speed *more gentle the slope slower the speed
When interpreting the motion answer: • As time goes by, distance (d or ) • The line shows relationship (constant or changing) d d d d t t t t • Moving forward (d) • No motion (d stays same) • Moving backward (d) • Moving forward (d) • Constant speed (straight) • Constant speed (straight) • Constant speed (straight) • Changing speed (curved) • 0 m/s • positive acceleration
d d d t t t • Moving forward (d) • Moving backward (d) • Moving backward (d) • changing speed (curved) • changing speed (curved) • changing speed (curved) • (-) acceleration • (-) acceleration • (+) acceleration
AB • Move forward • Constant speed • ΔY 10m 1m/s = = 10s ΔX BC • At rest • Constant speed • 0m/s
CD • Moving backward • Constant speed • ΔY 5m 1m/s = = ΔX 5s DE • Moving forward • Changing speed • (+) acceleration
EF • Moving backward • Constant speed • ΔY 25m 5m/s = = ΔX 5s FG • Moving forward • Constant speed • ΔY 10m 2m/s = = ΔX 5s GH • Moving forward • Constant speed 12.5m • ΔY = 1m/s = ΔX 12.5s
Which line had the fastest speed? • EF • Steepest slope Distance increases? • Moving forward Distance decreases? • Moving backward Straight line? • Constant speed Curved line? • Changing speed d vs. t graph shows? • Speed and direction