Statics and structures

5 ready-made scenes. Each opens in the studio; press Play to run it, then change anything: masses, lengths, the forces, what the graphs show.

Seesaw: Moments Research
4 kg at 0.75 m balances 3 kg at 1.0 m: the moments about the pivot cancel. Change a mass or a distance (m₂, d₂) and watch the plank tip.
Ladder against a Wall Research
A ladder on a smooth wall stands only if the floor friction is at least ½cot θ (0.29 at 60°). Set the floor friction to 0.2 and it slips.
Bracket: Strut and Tie Research
A strut and a tie hold a 4 kg load: the tie pulls mg√(L²+h²)/h, the strut pushes mgL/h. Analyze → Member Forces lists them.
Weight on Two Cables Research
A 5 kg weight hangs from two cables at different slopes: the sine rule gives both tensions, and the free-body diagram closes.
A Simply Supported Beam Research
A beam on a pin and a strut carries two weights. Moments about the pin give the strut's push, R_B L = Σ W x; the vertical balance gives the pin's.