STEM Lesson Design

For my final post about my Intro to STEM class, I wanted to sum up what we learned about designing a STEM lesson.

Never forget that students are the center of the learning process, and every lesson should be guided discovery. Be careful of giving them the answer or telling them what they should be getting out of the lessons. Make projects central rather than peripheral to the design – projects aren’t an aside, but rather ongoing and central part of the learning process.

Make sure that projects are broken down into manageable pieces – the younger the student, the more breaking down/scaffolding needed. Structure it and tier it in the classroom (not “here’s the big project, go do it, turn it in three weeks from now”). Projects must have real-world relevance. Start by taking an idea and building a unit around it. Projects should conclude with a product or performance task – a project, a product, a presentation, a poster. Something to show for all the work they’ve done.

Use digital technologies to support and enhance student learning, but don’t forget that thinking skills are an integral part of project work. Use varied instructional strategies that support multiple learning styles, and include ongoing and varied types of assessment.

One of the best bits of advice on motivating students was to phrase tasks this way: “A good student would do…a great student would do…” For example, for the experiment for the effect of color on heating rate, you might say, “A good student would do two different colors. A great student would do three.”

Just some final thoughts on resources:

Homeschoolers on eBay are a great resource as they buy good material and then sell it when they’re done.

For an (admittedly expensive) intro to robotics, check out The Lego Mindstorms series of kits.

The Maker Education Initiative is an organization devoted to project based learning, in particular “making” a product. A representative observed our solar heater project and said that’s what Maker Ed is about.

A MOOC is a Massive Open Online Course – in short, free classes that anyone can take. Find MOOCs at Coursera. Stanford University also offers MOOCs, including those by the amazing Dr. Jo Boaler.

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Solar Hot Water Heater Unit

For the final unit, we studied solar heating in general and solar hot water heaters in particular. Working individually, we started with a web quest researching solar hot water heaters. As a teacher, think about what question to ask so that the students aren’t landing on the same webpage and thus sharing the same info. Alternately, give them the search term and assign groups to report on the first page of results, second page of results, third page etc.

After fifteen minutes, we wrote our facts up on the white board.

Solar Heater Webquest

Next we were put into pairs, and each pair decide how to sort the facts written (make their own categories) and then add two more each, and make a poster with this information. This makes students think about all the shared information, since students tend to want to interact only with the portion they are responsible for. We then shared out our new information.

Solar Heaters sorted

Another group’s sort, with the new facts in green.

 

To see if different colors absorb solar radiation at different rates, we did an experiment.  We were given mason jars painted with different colors: white, orange, and black. We filled the jars with equal amounts of water and took the starting temperature of the water. We then took our jars outside and placed them in the sun. We took the temperatures of each jar at even time intervals and recorded the results.

Three Colors

We then wrote up a lab report following this template:

1. Beginning ideas – What are my questions?

2. Tests and Experiments – What did I do?

3. Observations – What did I see, hear, smell, feel? How did I measure what I observed? Graphs and interpretation of graphs of any data collected.

4. Claims – What can I claim as a result of my observations?

5. Evidence – How do I know? Why am I making these claims?

6. Reflection – How have my beginning ideas changed?

7. Redesign or Extension – How can I use my new ideas to improve my design (engineering) or investigate something new?

We also had to graph the temperature vs. time data for each colored jar on the same axes, and use the graph to address the question, “Does the color of the jar make a difference in the heating of the water?” making sure to support all claims with evidence.

There are many possible extensions to this experiment, such as: type of heat transfer (radiation, conduction, convection), estimating temperature at certain time, Newton’s Law, graph analysis (curve fit, find the linear functions): will it eventually plateau and would they all be the same?

We did a graph analysis using TI-84 graphing calculators to graph and do a regressive analysis of the data. I want a class set of these calculators so badly!!

Finally, we were put in groups of four to build a solar water heater to increase the temperature of 1 gallon of water as much as possible in 45 minutes.   We brainstormed in groups and came up with a design. We could bring anything we wanted from home, but we were limited to spending no more than $10 on the project. We would have ninety minutes to build the next day, and then after our lunch break we would test our designs!

 

 

Group 1The first group’s was a solar reflector-type, with a gallon can in the center for the water, insulated with bubble wrap.

Group 2

Group two used a coiled black hose, and a gravity siphon to circulate the water.

Group 3

The third group used reflectors focused on an aquarium which would function like a greenhouse.

Group 4 Initial

Our group used a coiled black hose, with a pond pump to circulate the heating water.  We also used solar reflectors.  Unfortunately, it worked too well, and our rig melted in the concentrated sun!

So for our experiment we just used the solar collectors.

Group 4 Revised

This was the culminating activity of the week.  We discussed our results, and how each rig could be improved, as well as which type would be best suited for large-scale use.  We even had a representative from Maker Ed who encouraged our work!

 

Gear Unit

Our second unit was an example of taking one idea and looking at it from different STEM perspectives – in this case, gears. To bring in the student perspective, we had guest learners – kids!! So each group had one third grader.

We started with a web quest to answer the question: What is technology? We discussed, and then each of us had to post a unique example of a technology on the wall – no two could be the same.

Technology Word Wall

We had some gears to play with to see how they worked.

Gears

One of the two sets of gears we worked with.

We answered questions such as: How can you get one gear to turn another in the opposite direction? The same direction? How can you turn a gear once and have another gear turn twice? Do gears push or pull each other?

Then we had STEM related questions.  For my focus – math – the questions were:

  • Find a pair of gears such that if you turn one gear twice, the other gear will turn once. How many teeth are there on each of the 2 gears?
  • Find a pair of gear such that if you turn one of the gears 3 times the other gear turns 4 times. How many teeth are on each of the two gears?
  • How can you mathematically represent the data collected in questions 1 and 2?

We looked at different examples of gear driven machines: corkscrew (arm type), bicycle, watch with exposed gears, egg beater, drill, can opener. Then, using K’Nex, each group built a gear-driven machine.

KNex 1

KNex 3

 

KNex 2

The gear focus was extended to bicycles. Two kid’s bikes were brought in. First we had to make an accurate scale drawing of the bike, indicating our scale. Then we did some math:

For one revolution of the pedals, the number of revolutions that the rear tire makes depends on the number of teeth on the gears. Record and reflection the following for your bicycle:

  • Number of Teeth on the front gear (pedal)
  • Number of Teeth on the back gear (tire)
  • Number of Revolutions the back tire makes for one revolution of the pedal

What is the distance your bike travels in 10 revolutions of the pedal?

How many revolutions would you have to pedal to go on a 1 mile bike ride? (Assume no coasting)

Then we needed to find the following geometric shapes on the bike: a line segment, a triangle,    an acute angle, an obtuse angle, parallel lines, a quadrilateral, a pentagon, and a circle.

I love this unit and plan to use in my Geometry class next year once they’ve been introduced to geometric notation.

Carbon Footprint Unit

Our first project was an example of a big self contained unit on Carbon Footprints. We started with a “hook” which was the Green Ninja Video. Then we had fifteen minutes to do a web quest, “What is a carbon footprint?” We talked about that and then came up with a class definition for Carbon Footprint. We took an online quiz ranking our own carbon footprint and then reflected on our results in our notebooks. To sum up, we each had to make a poster of our average day and its footprint.  This is another student’s poster (I didn’t get a picture of mine):

Daily Footprint

Since Carbon Footprint is such a large topic, we narrowed our focus to Carbon “Foodprint” (the footprint of what we eat). We were given an article to read, jigsawed so that each pair of students just had one part and was responsible for creating three sides in a Google presentation, which was then presented to the class. We did an activity called a Silent Gallery. We were each given an 11×17 piece of paper folded to make a booklet. We labeled the front with the topic, our name and the date, which left seven pages to fill. Each table of seven was given a stack of seven laminated cards, each with some information about Carbon Foodprint. In silence we passed the cards to the right every two minutes, taking notes in our notebook. At the end, we passed the cards to the right again, with each student having two minutes to present that card and their notes. This is a great EL activity, because the cards were full of color, pictures and graphics. It is also engages the less motivated students, because they only have two minutes to make notes.

The project portion was about food choices and building a better burger. We started with a hook video about lab grown hamburger. We then read a short article from Scholastic Math about the artificial burger, and were each given three cards on which to record two true facts from the article and one lie. We then went around the room and exchanged cards, to see if our partners could spot the lie (alternately, students could present their cards to the whole class). We then had a lab activity to “Build a better burger” to be judged on four qualities: Appearance, Taste, Texture, and Carbon Footprint. As a class, we designed the judging criteria by splitting into four groups to design that part of the rubric (this was done in a shared Google document so we could all create it together).

Now the fun really started: building our burger! We were given an array of foods, such as various canned beans and grains, tofu, and seasonings. We were provided with food processors and electric grills (think George Forman). In groups, we had to follow specific steps: Design what our burger would be made of, Plan our preparation process, Build our burger including cooking, Test each burger, and Report/Reflect on our results and improvements we would make. To test, we each made a burger to be shared with the class, and each group tasted each burger and ranked it according to our rubric.

Finally, we each made a footprint poster to summarize our feelings about the unit.

Carbon Foodprint

What struck me about this unit is how it made the topic of global warming personal. It forced the students to reflect on what carbon emissions mean in terms of the lives we all lead. So this unit was relevant to the students. This also hit all four Cs: Communication, Collaboration, Creativity, and Critical Thinking.

Intro to STEM

What is STEM

Man, oh man was this a great class! We worked through several different integrated project based lessons to model what STEM learning is all about. One of the main things is to mix up activities – don’t do the same thing every day! When pacing, keep in mind that these activities were done with college graduates over a week of all-day school.

We were armed to the teeth.

Stem Materials

We started with an ice breaker: Pipe Cleaner Towers. Using 15 pipe cleaners, each pair had to build the tallest, free standing tower in ten minutes. After a few minutes, we had to put one arm behind us. After another few minutes, we were told we could no longer talk. We had a few more minutes to finish. I loved this activity so much I think I’m going to do it on the first day of school this year.  Here’s my team’s tower (the winning tower, by the way):

Pipe Cleaner Tower

I’ll go into more depth on each of the projects in my next few posts.