The Reflective Educator

Education ∪ Math ∪ Technology

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Sometimes the Technology is Necessary

We can argue that good teaching doesn’t need technology, and I’m going to agree with that. There lots of really powerful learning opportunities you can do with students that require no technology at all. In fact, if it works better without the technology, don’t use it. You are just introducing the risk that the technology will fail and your lesson will flop.

However, there are some things you cannot do without technology, and they are interesting and engaging learning opportunities for your students.

For example, I want my students to understand that when a ball bounces, the heights of each bounce closely match an exponential function. We’ve talked before how they match a decreasing geometric sequence, but I want them to really see and understand this phenomena.

So I had students first video record a ball bouncing, and then use this video recording to accurately record the heights of each bounce. Students did their recordings, and right away had questions. Here’s an example.

The thing is, you can’t accurately find the heights of the bounces without technology. Trust me, I’ve tried. I’ve had students measure with meter sticks and do 10 trials and find the mean of the heights, and all sorts of other tricks, but every time there is at least one group with really bad data. Data which makes the whole point of doing the exercise useless. You really only need to learn the lesson about experimental error a few times before you either give up, or find better ways of collecting your data.

Here are some examples of what the students did to find the heights of the bounces. What I found interesting is that they didn’t really use new technology to do their measurements, they relied on what they knew how to do, which is measuring with a ruler. So I would say this activity so far is a mixture of new technology and very, very old technology.

Student measuring on a wall

Notice the student (in the photo below) is using stickie notes to keep track of different positions of the ball at different times. I really thought this was a creative way to help make the measurement taking easier.

Student measuring on their laptop

Here a student is measuring the distance directly with their ruler. At this point we had a great conversation about what this measurement meant. The question the student asked was, how do I find the actual distance the ball travelled during a bounce? She answered herself, and realized she could use the scale of the relationship between the height they dropped the ball on the screen, and the real world height. I pointed out that they could save themselves some effort, because the relationships between the bounces (what we were interested in) did not depend on the actual heights of the bounces, only on their relative heights.

Student using a ruler on a laptop screen.

So what we see a mixture of technologies the students are using and some obvious opportunities for learning to occur.

The technology is sometimes necessary to teach a particular concept in a constructivist way. In this case, the technology greatly increases the accuracy of the measurements the student is making. It makes enough of a difference that in the regression analysis the students did (using a spreadsheet program which is another useful technology) all of the students discovered that an exponential function is the best fit function for their data.

To make this point even more obvious, check out this high speed video footage of a drop of water landing in a pool of water.

You can’t see this phenomena clearly without technology to slow down time for us. It just isn’t possible. Some things worth learning in schools are impossible without using the appropriate technology.