Editing Inertia Trick (section)

== Why This Works ==

This demonstration is showing ''Inertia'': an object in motion stays in motion, until acted upon by an outside force. Also, an object at rest stays at rest until acted upon by an outside force. When you pull the piece of cardboard away, the tubes are pulled sideways. This is because they experience the sideways motion of the cardboard below them, and so they are put into motion as well. The fruit, instead of the cardboard pulling it sideways, will fall straight down into the cups! This is because the fruit is at rest while the cardboard is pulled out, and stays at rest until the cardboard tubes move out from underneath. Then, gravity does the rest and pulls the fruit down, and they land in the cups! This demonstration can be adapted to show how the ''mass'' of the moving pieces can affect the results of the demonstration. Smaller, less massive pieces of fruit will be affected more by the moving cardboard below than larger, more massive fruit. Also, the height of the cardboard tubes can affect whether the fruit falls into the cups or not.