# HST23 Equilibrium of Forces

A force board is clamped into the working area of HST1 Universal Frame and Stand (sold separately). Single and double pulleys sets can be fixed round the perimeter of the HST1 to produce an infinite variety of multi-directional forces in a vertical plane.

By using a single cord ring (concurrent forces), up to six cords can be attached and the cords tensioned with load hangers and weights to obtain equilibrium.

The lines of action of the cords are transferred onto a sheet of paper (not supplied) clipped to the force board using the board clips provided. Two cord rings held together by a short cord are used for non-concurrent force experiments. The set of weights for the experiment is included.

A comprehensive instruction manual for lecturer and student, giving full details on apparatus assembly and operation as well as example results. All necessary assembly and operational tools are provided.

Essential accessories: HST1

• The forces produced by cords tensioned by weights on hangers
• To use pulleys on the perimeter of the HST1 Universal Frame and Stand (sold separately) to turn the cords vertically downward
• The lines of force to be transferred onto A1 paper sheet (not supplied) clipped to the force board
• Single and double cord rings offer the alternatives of concurrent and non-concurrent forces
• Comprehensive technical manual for student and lecturer and text book provided
• Calibrated weights set and hangers supplied
• Must be used with HST1 universal Frame and Stand (sold separately)
• Comprehensive instruction manual provided
• 2 year warranty
• Equilibrium of a set of forces acting in a vertical plane
• Equilibrium of up to six concurrent forces
• Equilibrium of up to six non-concurrent forces
• Experimental verification of the three conditions of equilibrium, i.e. ∑ Fx = 0; ∑ Fy = 0; ∑ Mx = 0 (where F = forces and M = moments)
• Graphical solution of a triangle of forces (three forces) or closed polygon for more than three forces