Today was the first day of NGfL Cymru‘s presence at the Skills Cymru (Cardiff Millenium Stadium) and we were showing ourFree Vocational resources and our links with National Learning Network (NLN) to teachers and students. We were also engaging the children who stopped at our stand with some fun activities, like building walls with Lego bricks, folding napkins (we have learnt many fancy folds today) and building loudspeakers out of plastic and paper cups which were kindly donated to us by Starbucks and Burger King. Unfortunately, McDonalds decided not to be quite so generous and gave us no cups (I was very surprised about that, but maybe they too feel the effects of the Recession). Check out the instructional video on how to make the speakers below.
I have adapted this activity from one of the workshop the Institute of Physics does, i.e. Son of New Ideas. The link takes you to the group about this workshop on TalkPhysics. The IoP version of this loudspeaker is made with cup cake paper stuck at the back of children exercise books and it is a really nice activity, but because there is a lot of noise at the Skills Cymru event we went for a more powerful version and a bit quicker to build!
This activity is really good to get students engaged with Electromagnetic Induction, because they all have speakers and getting to know how they work and make one in few very simple steps brings the Physics to life immediately. They actually were amazed to find out that there really isn’t much more in a commercial speaker than the version they made (well there is a bit more, but the basic principle is the same). They are also finding very interesting to discover that their friends’ speaker is louder than theirs, for example, and they ask a lot of questions about why this might be! This is a good opportunity to use this activity in the classroom, as you could investigate whether the volume of the cup makes a difference in the intensity of the sound emitted, or the number of coils, the material of the cup, etc. And it is a nice opportunity to dig out your data loggers to measure the sound intensity and develop some interesting aspects of How Science Works. I hope you will have as much fun as we at NGfL Cymru are having with this nice idea.
Thanks to IoP for their ever amazing bank of resources and winning ideas!