Joanna and Julia wanted to test the magnetic strength by starting with an empty container (they used a pencil pouch) and then fill it gradually. A good idea!
Amanda and Matilda raced the magnets against each other on the whiteboard. They attached a small weight (my keys) to the magnet. They then measured the time it took each magnet to slide down the whiteboard.
Another test was to find out how many paper clips a magnet can pull up from a glass of water.
A popular test was to see how many paper clips a magnet could hold hanging in a chain.
We also constructed an electromagnet. First, we concluded that a large iron nail was not magnetic. Then we wrapped it in copper wire and connected it to a 4.5 V battery. As long as the battery stayed connected the nail worked as a magnet and we could use it to lift up some smaller nails.