Algodoo

To use the Shape flinger, you can use the drag tool to pull back the C shape (backwards C or and side ways U)

After you pull it back just let the thing go and watch the shape fling. (Arrows will show where to put the shape and where to drag from)

Delete the arrows and letter that would block the Shape Flinger from working correctly.
Can also be used as a renfrence to Angry Birds.