Mohr's Circle & Stress Transformation, Seen Geometrically

Mohr's circle shows up constantly in technical interviews at SpaceX, Tesla, Anduril, Blue Origin, and other hard-tech companies. Practice 1,800+ technical engineering interview questions with worked solutions: https://snubber.ai/youtube Mohr's circle explained from first principles, why stress at a point isn't one number, and how one piece of geometry gives you principal stresses, maximum shear stress, and the stress on any plane without touching the transformation equations. We cover the stress tensor, the anatomy of the circle, the angle-doubling rule, every loading condition (biaxial, pure shear, pressure), the 3D Mohr's circle interview trap, and how to read failure modes straight off the circle.