This simple kit allows you to put together a small magnetic accelerator.
From the product description:
Set the metal ball at the end of the track and watch as the energy transfers and multiplies down the track of magnets and metal balls until finally the last ball zooms off. The Magnetic Accelerator Kit is a great study for science fairs, but is just at home on your desk (just be careful what it sits near - these magnets are STRONG).
Here the link for the Magnetic Accelerator Kit.ZING!