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The Dropper Popper and Woodpecker on Pole experiments are both excellent demonstrations of the law of conservation of energy, showing how energy constantly changes form without being created or destroyed.

In the Dropper Popper video, half of a rubber ball is inverted and released. When it strikes the ground, it momentarily stores elastic potential energy as it deforms. As the rubber snaps back into shape, that stored energy is rapidly converted into kinetic energy, propelling the Popper upward, often higher than the original drop height (Educational Innovations, 2016). This might appear to defy conservation of energy, but it doesn't. Instead, the Popper's design allows it to efficiently convert gravitational potential energy into elastic potential energy and then back into kinetic energy. A small amount of energy is lost as heat and sound, yet the total mechanical energy of the system remains constant.

The Woodpecker on Pole experiment works in a similar way but emphasizes continuous energy transformation. As the wooden bird slides and "pecks" its way down the pole, gravitational potential energy converts into kinetic energy and small amounts of thermal and sound energy through friction. Each impact temporarily stores a bit of elastic potential energy in the spring mechanism before releasing it again, maintaining the bird's rhythmic motion (DrDaveBilliards, 2008). Though it looks as if the toy gains energy, it's actually redistributing and dissipating what it already has.

Together, these demonstrations clearly illustrate that while energy changes form, the total energy within a closed system remains conserved,a foundational principle in physics.