Learn how to make 2 versions of an Electromagnet. This demonstration can be used to explain the effects of a flowing current and magnetic fields! The 'easy' version involves a D battery and insulated wire while the 'intermediate' version uses a lantern battery, a switch, and insulated wire.
This demonstration uses a slinky and tuning fork to explain two types of waveforms in our world: transverse and longitudinal. A discussion on sound waves is included and leads to categorizing sound waves as longitudinal waves.