Stop motion animation is a technique used to make physically manipulated objects appear to move on their own. Because the object is moved incrementally between individually photographed frames, an illusion of movement is created. Though often time-consuming, stop motion films are a simple way for first-time animators to produce short or feature-length films cost effectively as they require minimal equipment and are relatively easy to edit.
If you have access to an iPhone or iPod touch, iMotion is a great free app for making stop motion films in the classroom.
Watch this iMotion tutorial.