Unit 3 Slideshow 3 - GRAPHS



Why are graphs helpful for understanding motion?  Graphs give us VISUAL, “easy-to-

understand” information about motion. 

GRAPH BASICS

y

 y-axis  ▪ dependent variable, dependent on xaxis changes

 x-axis  ▪ independent variable, values chosen by experimenter

0

x

1.

Always put a TITLE and LABELS on your graph.

2. Use a proper scale. That is, be sure to go up by EQUAL INCREMENTS, and use at least ¾ OF THE GRAPH when plotting points.

2. Use a proper scale. That is, be sure to go up by EQUAL INCREMENTS, and use at least ¾ OF THE GRAPH when plotting points.

3.

If the points follow a STRAIGHT LINE PATH, draw a LINE OF BEST FIT.

3.

If the points follow a STRAIGHT LINE PATH, draw a LINE OF BEST FIT.

4. If the points follow a CURVED LINE PATH, draw a CURVED LINE.

4. If the points follow a CURVED LINE PATH, draw a CURVED LINE.



y-axis  DISTANCE x-axis  TIME

distance (m)



time (s)



The SLOPE of a DISTANCE-TIME GRAPH is equal to the SPEED. SLOPE = rise = y2 – y1 run x2 – x1



y-axis  DISTANCE x-axis  TIME

distance (m)



time (s)



The SLOPE of a DISTANCE-TIME GRAPH is equal to the SPEED.

SLOPE = rise = y2 – y1 run x2 – x1

How can you calculate slope of a graph if the line is not perfectly straight? Vav = slope of the dashed line from initial to final point

distance (m)



time (s)



You can find Vav by DRAWING A STRAIGHT LINE between the INITIAL POINT and the FINAL POINT and calculating the slope of that line.

How can you calculate slope of a graph if the line is not perfectly straight? Vav = slope of the dashed line from initial to final point

distance (m)



time (s)



You can find Vav by DRAWING A STRAIGHT LINE between the INITIAL POINT and the FINAL POINT and calculating the slope of that line.





___________________ is biking from Corner Brook to St. John’s. The table below displays his distance every 12 h. TIME (h)

DISTANCE (km)

0

0

12

180

24

360

36

540

48

720

Using the above information,  Draw a DISTANCE-TIME graph.  From the GRAPH, determine his AVERAGE SPEED.



Do #s 2, 3, 5, and 6 on page 365 in text for homework.



HELPFUL HINT  Your graphs will have more ACCURATE results if you

make them LARGER in SIZE!

Unit 3 - Slideshow 3 - 2013 DistanceTimeGraphs.pdf

THE GRAPH when plotting points. Page 4 of 17. Unit 3 - Slideshow 3 - 2013 DistanceTimeGraphs.pdf. Unit 3 - Slideshow 3 - 2013 DistanceTimeGraphs.pdf.
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