DESIGN AND CONSTRUCTION OF A LOW-COST DUAL-MODULE FLUID MECHANICS APPARATUS FOR A-LEVEL PHYSICS INSTRUCTION
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Date
2026-09-29
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Abstract
This study addressed the persistent "practical deficit" in physics education within Ugandan
secondary schools, a challenge exacerbated by the high cost of imported laboratory equipment and
the structural demands of the 2025 National Curriculum Development Centre (NCDC)
competency-based syllabus. The primary objective of this research was to design, fabricate, and
empirically validate a low-cost, durable, and integrated fluid mechanics instructional apparatus
utilizing locally sourced, post-consumer polymers. The engineered system comprises two distinct
operational units: a Fluid Statics Module employing a master-slave arrangement of graduated
polystyrene syringes to model Pascal’s Principle, and a Fluid Dynamics Module combining
recycled Polyethylene Terephthalate (PET) bottle funnels and transparent Polyvinyl Chloride
(PVC) conduits to construct a functional Venturi flow tube with integrated piezometric
manometers. Quantitative testing and calibration trials were conducted in the Department of
Physics Education laboratory at Busitema University to evaluate the metrological accuracy of the
apparatus. The Fluid Statics Module demonstrated excellent hydrostatic reliability, yielding an
experimental force amplification deviation of only 4.9% from the theoretical geometric area ratio.
Concurrently, the Fluid Dynamics Module successfully mapped localized pressure head drops as
fluid velocity accelerated through the Venturi throat, maintaining an operational error margin of
9.2% under steady flow conditions. Both values fall safely within the 10% maximum error
threshold mandated for Advanced Level physics practical examinations. Additionally, localized
dye-injection configurations allowed for the direct visual identification of laminar-to-turbulent
flow transitions. These findings indicate that localized material improvisation using engineering
grade scrap polymers offers a scientifically precise, economically viable, and pedagogically
transformative alternative to conventional imported laboratory glassware, effectively bridging the
gap between abstract fluid theory and classroom experimentation.