Various interesting cases in conjunction with weighing on Shabbos.
(Melting ice.) melting ice that is sitting on top of a drink. (E.g. on top of water, orange juice, grape juice, etc.); the difference...
Wind-Up Toys, Swings, etc.
Understanding the Concept of Leaving an Item on a Tree from Before Shabbos into Shabbos. Some Halachas About Using the Side of a Tree;