This visual puzzle looks simple, but it tricks many people on their first try. The drawing shows a wooden beam passing through a vertical post, with a brick resting on the right side and three chains labeled A, B, and C helping hold the structure in place.
The big question is: Which chain must break for the brick to fall?
The correct answer is B.
Here is why.
The brick’s weight pulls the right side of the beam downward. If that happens, the left side of the beam rises upward. That movement is the key to solving the puzzle.
Chain B is attached from the left end of the beam to the lower part of the post. As the left side tries to rise, Chain B becomes tight and resists that motion. In other words, B is the chain that actually stops the beam from rotating downward on the brick’s side.
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