This experiment demonstrates the tendency of certain materials ("diamagnetic" materials) to be repelled from magnetic fields. First create a swivel. Poke a push pin through the center of a film canister lid from the bottom, then through one side of the center of a straw. Insert end of the straw into a grape, and mount the straw and swivel on the film canister. Bring a magnet near either of the grapes and observe the results: The straw will slowly turn on the axis. This experiment demonstrates that water (contained within the grapes) is diamagnetic and is repelled by magnetic fields.
Another experiment that can be performed is viewing magnetic fields put off by various magnets. First obtain a magnetic viewing film. This device contains powdered iron in an oil medium and displays the shape of nearby magnetic fields visually. The white line on the film indicates the border between north and south poles or charges. Use a magnetic viewing film to view the magnetic fields of various magnets, and record a basic sketch of each field's visual representation on the film. Analyze the different shapes to identify anomalies and differences in the magnetic fields.
Testing magnetism is a simple experiment that only involves testing various materials with a powerful magnet. Test small metal objects (such as coins, screws or buttons) with the magnet, and observe any attraction or repulsion. Some minerals are also magnetic and will respond to this test. Additionally, magnets can be used to demonstrate the magnetic content of items such as two-dollar bills, VCR tape and pulverized fortified cereal.
This classic experiment also doubles as a possible survival skill. It demonstrates the process of magnetizing and the interaction between magnets and the Earth's magnetic field. Rub a needle along the surface of a magnet in the same direction 60 to 80 times; this temporarily magnetizes the needle. Suspend the needle from a thread, or place it on top of a floating item such as a cork. The needle slowly turns and aligns itself to the Earth's magnetic north, acting as a basic compass.