Seesaw Log Bridge
From the Super Mario Wiki, the Mario encyclopedia
Seesaw Log Bridges are solid wooden platforms appearing in New Super Mario Bros. U, New Super Luigi U, and their remake. They have two different properties: either they rotate in either direction, or they tilt from top to bottom while one end is fixed to a ground tile. In New Super Mario Bros. U, they only appear in the level Seesaw Bridge, where they are extremely common throughout the level. In New Super Luigi U, they appear in the level Sumo Bro Bridge, where they are shown absorbing Sumo Bros.' electricity.
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