This rock tumbler experiment takes a simple batch of old coins and puts them through a dramatic cleaning and polishing test ...

WXMI — In our science experiment today, we look at a disappearing coin trick, which really is no trick at all. It illustrates density and refraction. Some things are more dense (or heavier) than other ...

Experimenting with a rock tumbler and a handful of coins leads to a surprisingly intense process where constant friction, ...

The principle of inertia is a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force. We are ...