Physics Visualisations

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Block on an Incline
Free-body diagram of a block on a slope. Static friction holds the block until the angle exceeds arctan(μs); after that it slides with kinetic friction μk·N.
Ladder Hinge
A ladder hinged at the base of a wall, with a 2 m stretcher hanging from it. A rope from an anchor behind the top of the wall holds one end of the stretcher, and an attachment from the other end runs to the ladder. Everything settles where the torques and forces on the ladder and stretcher balance.