(:title Car Race InterActivity:)
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(:showhide init=show div=div2 lshow="+" lhide="-":) Click and drag the sliders to set the cars speed and starting position.
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Then click on the animation buttons:

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[]>>&<>&<<%exa b%Problem:%% Set %red%'''RED CAR:''' Speed=15km/h and Start=24km%% and
%ref%'''BLUE CAR:''' Start=0km%%.
>>&<<%mor b%Question:%% If the cars meet in 4 hours, what is %ref%SPEED of BLUE CAR%%?
>>&<< Use the activity to find your answer and then talk about the math.
>>&<<%pra b%Answer A:%% Using the activity.
*Set the 3 sliders.
*Think about what it means to "meet in 4 hours".
*Find t=4 on the horizontal axis.
*Move the 4th slider (speed of blue car) until the lines intersect above t=4.
*See that the slider is at 21km/h.
>>&<<%dkr b%Answer B:%% Thinking about the math.
*Thinking: blue car has to "catch up" 24 km in 4 hours.
*This means it must go 24km/4h=6km/h faster than red car.
*The speed of red car is 15km/h.
*So the speed of blue car is 15km/h+6km/h=21km/h.
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This InterActivity needs ready-to-use in the classroom worksheets so:
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[[mailto:emath@emathforall.com?subject=CarRace|Please write me]] with questions/ideas for using this activity (include grade level).
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>>&<<
%rel b%Related Topics%%
* %exa c11%[[GlossaryT/slope|Slope]]%%
* %dkr%[[activity/runners|Runners Activity]]%%
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>>&<<(:showhide init=hide div=div9 lshow="+" lhide="-":) '''Metadata'''
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[ width=110px] Global
[] Car Race Animated Activity
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[]Brief
[]User speed and position of cars in a race to understand slope and intercept.
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[]Grade
[]6 (or any time after the idea of linear equations - does NOT require explanation of slope and intercept)
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[]Strand
[]Algebra and Functions [[http://math247.pbwiki.com/Algebra+and+Functions+with+GeoGebra| AF at Math247]]
Algebra [[http://math247.pbwiki.com/Algebra+with+GeoGebra| Algebra at Math247]]
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[]Standard
[]%popwin%[[standards/CA6AF-2-2?action=popopen|CA 6.AF.2.2]] %popwin%[[standards/CA7AF-1-5?action=popopen|CA 7.AF.1.5]] %popwin%[[standards/Is1al2-5?action=popopen|Algebra 1 2.5]] %popwin%[[standards/ACTgr24?action=popopen|ACT GR 24-27]]
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[]Keywords
[]linear, equation, rate, slope, intercept, dynamic, freeware, applet, offline, online
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[]Comments
[]This activity is suitable for younger children - just change the questions!
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[]Download
[][[http://mathcasts.org/gg/enliven/af/lines/slopes/car_race.zip|Zip for offline use]]
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[]Author
[]LFS - [[mailto:emath@emathforall.com?subject=ggb_racecar|contact]]
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[]Type
[]Freeware - Available for Offline and Online Use - Translatable (html)
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[]Use
[]Requires [[http://www.java.com/en/download/index.jsp|sunJava player]]
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