The FORCES range enables clear and comprehensive learning of STATICS and DYNAMICS covering a variety of theories and topics. An understanding of the way in which forces act and react, is fundamental when studying the application of loads on a variety of fixed structures and rotating machinery. The FORCES form a comprehensive range of equipment, from fixed beams through to rotating machines apparatus, equally suitable for demonstration and experimental work.
This equipment provides a simple easy to understand experiment on the equilibrium of moments. Several loads can be put on the beam at various positions. These will make the beam rotate. The student has to determine the moment necessary to overcome this rotation and keep the beam level.
This apparatus is used to verify that centrifugal force varies with the square of the speed, the rotating mass, and the radius of gyration. The bench top mounted unit houses a speed-controlled motor, which carries a horizontal boom assembly.
This assembly rotates up to 350rpm and onto which sliding weights are fitted and adjusted. The weights are attached to centrifugal rods, which move outwards during rotation and through crank levers apply a force to an integral load cell. The speed of rotation of the boom is displayed on the front panel along with the centrifugal force reading.
A unique feature is that all three variables can be set and the centrifugal force directly read from the digital force display. Six masses are supplied along with all the necessary tools, spares and accessories. A protective dome covers all rotating parts giving protection to the end user.
Rubber blocks in shear force are often used on engine and in equipment mounting to isolate vibrations. They do this by absorbing shock energy by deforming. This deformation leads to a decrease in cross-section as the block lengthens, an effect described by Poisson's Ratio.
After this experiment, students will understand the behaviour of a very flexible material such as rubber. Rubber is interesting in that the lay person regards it as an 'elastic' material. In engineering terms it is not as 'elastic' as steel and often exhibits a high degree of hysteresis.
Conservation of linear momentum is well understood and often demonstrated to students. Equally important is the conservation of angular momentum. It is not easy to do meaningful experiments on this, but a highly visual demonstration of almost dramatic impact is the effect of reducing the radius of a rotating mass.
This is often seen in an ice skater performing a pirouette. First they spin round on an axis corresponding to their body, arms outstretched. When they raise their arms above their head, the increase in spin in considerable. Rather than go to an ice rink, students can perform this experiments in the laboratory using the HFC25.
The unit allows the fundamentals of Statics, such as equilibrium, force resolution, the principles of levers, and similar issues to be clearly demonstrated.
The base unit is a freestanding board. All the parts necessary for the experiment can be quickly attached to the board straps and perimeter grooves on the edge of the board. Linear scales around the perimeter of the board allow for accurate measuring.
Two large board straps allow the mounting of the individual experiment components. Each strap has equispaced threaded holes to allow mounting positions to be varied widely. Two ball bearings facilitate low friction torque experiments. All forces measured using analogue spring balances. The board can be written on with the use of the non-permanent pens.