Now students can be given some direction. Working closely with students, encourage them to test various objects to see whether magnets will stick to them. Then categorize objects into magnetic and non-magnetic. In a follow up group discussion, work with the class to create a list of magnetic and non-magnetic objects. Prompt the children to think about the materials they have been using and draw upon that information as they compose their list.
Now engage the children in a demonstration and discussion about the types of metals that are magnetic. Present the following information to your class in a way that is developmentally appropriate for their age group. Modern magnets are made of steel and they attract objects that have iron and steel in them. (The Junior Science book of Magnets p.5) Steel is a commonly used hard metal. It is tough and fairly resistant to rust. Iron is the most common metal, it is a white and malleable. In contrast to steel, iron will rust quickly in a moist or salty environment. (Webster's New World Dictionary, p 744 and 1394). Magnets do not attract objects made from brass, copper or aluminum. (Mailbox, p.50). Collect a variety of metal objects, including, but not limited to: pennies, nickels, dimes, quarters, paper clips, thumb tacks, nails and screws, hardware, old computer disk, old cassette tape, old VCR tape, tin foil, metal scissors, tie tack, hair barrette, etc. Test each object to see which are magnetic. If you feel your students are interested, try to figure out what types of metals are in each object.