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UNIFORM MOTION

Describing Uniform Motion. Oddly enough uniform motion does not necessarily have any feel"of motion at all. (How could this be so?)Mathematically uniform motion is: A RATIO: V=?d/?t. This idea includes the slope of the velocity graph that is, the ratio of ?d:?t change in distance. . . . . . .

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UNIFORM MOTION

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    1. UNIFORM MOTION Uniform motion can be described by a simple mathematical ratio. Both distance and time measurements are required to describe uniform motion.

    2. Describing Uniform Motion Oddly enough uniform motion does not necessarily have any feelof motion at all. (How could this be so?) Mathematically uniform motion is: A RATIO: V=?d/?t. This idea includes the slope of the velocity graph that is, the ratio of ?d:?t change in distance. . . . . . . ?d = d f - d i (RISE) change in time. . . .. . . . . . . ?t = t f - t i (RUN) A VECTOR quantity having both: a magnitude and a direction.

    3. Measuring UNIFORM Motion Time and distance must both be measured. ( In the example at the right the data table is designed and prepared for the drawing of two graphs.) Distance /time graph (d, t) Acceleration graph (V, t) What would these graphs look like? The first graph at the right is uniform motion. How is this different from non uniform motion?( 2nd graph-click) These Graphs for uniform and non-uniform motion should be contrasted. First, the rate of change represented in the Velocity Graph -distance:time (?d/?t ratio) - is the slope of the velocity graph - the rise is the distance traveled and the run is the time of travel. The motion is uniform if the velocity graph is a straight line - the velocity is not changing with time. - this is shown in the acceleration graph as zero acceleration, a zero slope horizontal line and in the velocity graph as a straight line of constant slope) The motion is non-uniform if the velocity graph is a curved line - the velocity is changing with time - this is shown in the acceleration as a sloping line and in the velocity graph as a curved line of changing slope)These Graphs for uniform and non-uniform motion should be contrasted. First, the rate of change represented in the Velocity Graph -distance:time (?d/?t ratio) - is the slope of the velocity graph - the rise is the distance traveled and the run is the time of travel. The motion is uniform if the velocity graph is a straight line - the velocity is not changing with time. - this is shown in the acceleration graph as zero acceleration, a zero slope horizontal line and in the velocity graph as a straight line of constant slope) The motion is non-uniform if the velocity graph is a curved line - the velocity is changing with time - this is shown in the acceleration as a sloping line and in the velocity graph as a curved line of changing slope)

    4. The Language of Motion -1- Make a Chart (all on one page landscape orientation ) for the terms on p296. Use the center -page picture to help develop comprehension.. -2- Check your Understanding by doing the questions 1-5 on p304 -3- Read about VECTORS pp300 & 301 (Make content notes.) Develop your understanding by doing Heading for Home pp302 &303)

    5. Scientific Measurement This skill will be developed on a needs basis. The following resources will help develop skills in recording and interpreting scientific measurements: Power point: Scientific Measurement Related practice worksheets. Related practical activities.

    6. EXPLORING Uniform Motion The worksheet at the right allows you to change the variables of : distance, d / time, t The table recalculates and redraws the velocity and acceleration graphs for the new variables entered. Do the Data Studio Workbooks: matchgraph1.ds-matchgraph4.ds They will help you get a feel for uniform motion as they relate movement to the shape of a graph.

    7. 1- WALKING IN UNIFORM MOTION p308-309 Use the table provided: measure data for walking in uniform motion. Make measurements for 12m /12s in equal time intervals. Then complete the graphs. DO Q1-7 p308-309 Review Precision pp299-300 2- Read p305 9.3 Measuring Motion with TICKER-TAPE Do Questions 3-6 p314. Do two graphs for comparison one for uniform one for non-uniform motion. Use about 1.6m of tape. Consolidation 1: Uniform Motion

    8. Motion PROJECT -1-DESIGN AND BUILD A MOUSETRAP CAR. The design parameters and approved materials list are in the handout. http://scifair.ednet.ns.ca/CKCLS/isci10/mtc02/mywebquest/index.htm Completion date for the car with 10 m trial run __________ -2- PROJECT REPORT Modify for (2.5-10 m) run if necessary and collect data for the cars motion characteristics. ( depending on how the motion is measured, ticker-tape, stopwatch, sonic ranger . . . ) Completion date for the project report. __________

    9. Consolidation REVIEW: Uniform Motion -1-Complete the two tasks, EXPLORING Uniform Motion Spreadsheet simulation ?d/?t, ?v/?t Qualitative simulation Quantitative simulation -2- Complete the quiz on shapes and trends of typical motion graphs for uniform and non-uniform motion.

    10. THE END Last modified, January 2002

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