Especially in the winter months, I enjoy a good cup of strong, hot coffee. So I purchased the 12V and USB Travel Mug from ThreeSixty Lifestyle. It is a nice looking mug with a cover but on my first use, it didn’t seem like it really was adding any heat to the coffee.

So I got out my probeware and Spark (from Pasco) and put it to the test. First, I determined that the coffee in our coffee pot is 80° C (degrees Celsius or 176° F ).  To test the mug, I filled it almost full (350 mL) with water at about 80° C (beverage heating for 12 ounces in our microwave) without plugging into my USB. Then I dumped this out and started again and I tested it with 80° C water with it plugged in.

From the first graph, after about 80 minutes it had a temperature of 46° C. From the second graph it kept a constant temperature of 60° C after

Graph 1: Cooling Curve with No Electrical Heating

falling for the first 28 minutes. So clearly heat is being added with an equilibrium (heat lost=heat gained) established at 60° C with a room temperature of approximately 20° C. But is it worth the bother to plug it into my computer and have a tethered cup? Without heating the cup, the

Graph 2: Cooling Curve with USB Electric Heating

water stayed above 60° C for approximately 30 minutes. It seems like both cups took about the same amount of time to cool to 60° C so there is no advantage for my first cup of jo in the morning, as that usually doesn’t last 30 minutes. Later in the morning, when I tend to let the coffee sit longer, it might pay to have it plugged in. But coffee at 60° C doesn’t give me that coveted deep-warming feeling. So good thing I bought this at Big 5 Sports, as they are quite good at accepting returns.

When it comes down to it, I would like to find a coffee heater that has a

Image from "Melting and Boiling Points: Heating Curve" from Adaptive Curriculum

heating curve, rather than a cooling curve.  Perhaps I need a hot plate, like the one shown in the image from Adaptive Curriculum to the right. Bring on the heat!

When we add technology to our repertoire of science activities, the best uses are for areas that allow students to do things that they could not do before. A simulation that allows students to explore falling objects with different forces of gravity, like Adaptive Curriculum’s “Free Fall”, extends learning beyond the walls of a classroom.

In a similar way, the best probeware allows students to discover things beyond the ordinary science classroom. So, if a school only had a budget for one probe, I recommend that it not be a thermometer, pH, or voltage probe, but rather, PASCO’s Passport motion sensor. Combined with PASCO’s EZ-Screen, this product is so much fun that instead of selling soda to get supply money, a science teacher could charge students a quarter a try. It is more fun than the token games at our local movie theater.

Motion Sensor

The name “motion sensor” is confusing. One might think it could turn lights on and off when walking into or out of a room. But these don’t; they really should be called “distance detectors”. The detector emits sound pulses that travel outward, and if something is in the path, the sound hits it and bounces back to the detector.  It tells how far away a person or object is located, based upon how long it takes the wave to travel to and from the probe. Since it is measuring distance from a fixed point (the detector) in a specific direction, it can be used to track a person or object’s displacement versus time. When the person moves in or out, their displacement from the probe is indicated in the form of a line graph. Thus a student can make a real time displacement-time graph and instantly understand a topic that many students find confusing.

EZ-Screen

The group that designed EZ-Screen should get an award. It is bright, fun, and engaging, which is not easy to say about a lot of graphing software. I recommend starting with free explorations of what happens when students move in, move out, and rest. The graphs show immediately what happens.  Charging students twenty-five cents a try is recommended.

The most fun comes when students try to match a graph (see picture). They see a gray line graph on the screen and then try to walk in such a way that the graph is replicated. They see the graph that was created (scarlet) against the match graph (gray), and get a score (100 being the highest). Bringing in the element of competition amps up the engaging value.  (Like when I connected my son’s PS3 online and then played his NCAA 08 Football; competing against a real (even though unknown) person made it so much more interesting to play as the scarlet and gray team.) The match graph and the actual graph my 8 year-old son and his friend made is in the picture to the right. How could they have possibly known the sleep over would be this much fun?

Science Class

For science instruction, I break my class into small groups with each having a computer and a detector. They start with free exploration. Then they practice doing the first match graph. After a few trials, they have a competition to see who is the best for the second match graph. I tell them not to do the third and final match. Each group sends their top contender to the front probe, which is also connected to a projector. We then have the finals, to award the title of “Grand Displacement-Time Graph Champion”. This was great fun and learning for my middle school science children this semester, and for adult preservice teachers in previous semesters. If you set up a little bookie operation you can make some more money by taking bets on the finals. I recommend taking 10% of the action.

Of course, with this probe you can do other things as well with other PASCO software, like dropping a table tennis ball and seeing a free fall graph. And then you could go to Adaptive Curriculum to explore free fall with different gravitational forces.

Conclusion

While technology might be used because it makes some things easier, I think when we are on limited budgets, starting with things that we can’t easily do, or that are impossible to do with regular tools makes the most sense. So let your students explore other planets with Adaptive Curriculum, and let them see that some graphing is great fun with EZ-Screen and motion detectors. It’s just too bad that they don’t turn off the lights.

The question is… What will you buy with all the money you make?

Adaptive Curriculum's Free Fall

For the Record

I hope you know I was kidding about the quarters and 10% of the action on the betting. I prefer Twinkies and other lunch snacks instead of quarters and I limit myself to 8% of the gambling action. 

The references to Scarlet and Gray does suggest an affinity for Buckeyes. 

Some people use the term dataloggers instead of  probeware.  If you wear smell sensors connected to clothing armpits, these are called probewear, otherwise the term probeware is preferred.