A wooden model of a ladder leaning against a wall demonstrates the angle that the ladder will slip down when weights are hung from various rungs of the ladder.
Statics of inclined planes, levers etc. can be done with the Blackboard Mechanics Set [1].
A multiple strut and brace framework can be set up on the lecture table. Force indicators (indicating newtons) are placed in the framework to show the balanced forces. The biceps muscle shown above is an example. An instruction manual showing various set-ups is available (hoisting, wall crane, roof truss, etc.).
Links:
[1] https://demoweb.physics.ucla.edu/node/400