Water Tank Filling
by Dan Meyer
35
skips
skips
65
questions
questions
Act One
 1.
What's a guess you know is too high?
 2.
What's a guess you know is too low?
Act Two
 3.
What information would be useful to know here?
 ImageSide length
 ImageThe height
 ImageUnit conversion
 VideoFlow rate
 ImageDistance across
Act Three
 VideoAnswer
Sequel
 VideoThe water tank emptying
 4.
How long will it take the water tank to empty? What's your guess?
 VideoFlow rate emptying
 VideoAnswer
 Teacher noteThis is an attempt to draw out students who apply a rates model without thinking about whether or not it's appropriate. In fact, the water fills at a constant rate but it doesn't EMPTY at a constant rate. The water empties faster the more water is IN the tank because the weight pushes it down. It's just a productive gotcha moment.
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how long to fill? Actual question: did you fake the textbook problem in the text book in your TEDx talk and why?

How long will it take to fill up the whole tank? How much water does it hold?

How long will it take to fill? How much water does the container hold?



















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