As of now all of the quizzes have been scored and the feeling of being impressed continues! I will do the same for the upcoming unit test on the 22nd by posting a study guide and a practice test (or two - you never know). I will again be printing out hard copies if you prefer that medium.
We started off science with a four question warm-up. I allowed the students to do this together in groups.
After discussing it, the class did the following constructed response. I am using a rubric to grade each paper.
Then, we did the fun activity. To reinforce the concept of polarity I had them build the world's simplest electric motor: the homopolar motor. It is good for demonstrating the concepts so that is the reason behind it.
A homopolar motor consists of only four components: a 1.5 volt battery (in this case, AA), a 5-6" piece of wire with each end stripped, a small (1/4") neodymium disk magnet (it has to be neodymium for it to work), and a 1.5 inch machine screw.
Step 1: attach the magnet to the head of the screw
Step 2: allow the combination magnet and screw to attach to either end of the battery by force of attraction. This is why the powerful neodymium magnet is necessary.
Step 3: Connect one end of the wire to the other end of the battery and hold it down either by hand, electrical tape, solder, etc.
Step 4: touch the other end of the wire to the magnet. Usually, it works best for the side of the wire to touch the magnet. This will cause the magnet and screw to spin and bounce around.