Static Equilibrium
An object is hung by two cords. The location of the points were the cords are attached to the surroundings can be varied to observe the change in the tension in the two cords.

Balancing Blocks Over the Edge
One block is placed on the end of another block that sticks out over the edge of a table top. The system is observed to not tip over if the center of mass of the system is not over the edge of the table.

Rotational Equilibrium of A Bar
A horizontal rod is connected to a wall at one end and suspended by a cord also connected to the wall. A bob is hung from the end of the rod. Displayed are the forces acting on the rod and the tension in the cord. The mass of the bob can be altered as well as the location of the point of attachment of the cord to the rod.

Hanging Pumpkin
A pumpkin is hung by a cord. The pumpkin is pushed to the side by an applied force in such a way that it stationary at one angle away from vertical. Displayed are the force acting on the pumpkin. If the mass of the pumpkin or the applied force is changed, then the pumpkin will oscillate about the equilibrium angle.
Hanging Pumpkin Problem

Man on a Plank
A man stands somewhere on a plank supported by two vertical cords. Displayed is the tension in the cords. The position of the man as well as the mass of the plank and the man can be varied.
Man on a Plank Problem