Centre of Pressure





Description:

Learning objectives/experiments:
 
  • Studying the relationship between hydrostatic force and head of water for a fully and partially submerged vertical and inclined plane.
  • Comparison of actual and theoretical hydrostatic force on a fully or partially submerged plane for any given head of water.
  • Theoretical calculation of the position of centre of pressure on a fully or partially submerged plane.
 
Features:
 
  • This product allows students to measure the moment due to the fluid (hydrostatic) thrust on a fully or partially submerged plane. 
  • The plane works in either a vertical or inclined (angled) position. 
  • Students then compare their measurements with theoretical analysis.
  • The equipment consists of a vertical panel that holds a clear plastic quadrant, to which students add water. 
  • The quadrant has engraved lines to help students keep the plane in a vertical or angled position.
  • The cylindrical sides of the quadrant have their central axis coincidental with the moment measurement axis. 
  • The total fluid pressures on these curved surfaces therefore exert no moment about this pivot. 
  • Therefore, the moment is only due to the fluid pressure on the plane test surface.
  • Students measure this moment using weights suspended from a level arm. A scale on the panel of the apparatus shows the head of water.
  • To perform experiments, students level the apparatus using its levelling feet and spirit (bubble) level. They decide whether to test either a vertical or inclined plane.
  • They then initially balance the quadrant tank using one of the weight hangers and the smaller trimming tank.
  • They take results by balancing incremental weights on the hanger with known quantities of water. 
  • They then use the results to calculate the equivalent moment of force (M) or hydrostatic thrust. Students note the relationship between the moment and the water height (h).
  • The equipment includes non-toxic water dye to help students see the water levels more clearly and a syringe for accurate addition or removal of small amounts of water.
  • Specification/ Technical data
  • Nett Dimensions and Weight: Approx. 460 mm wide x 400 mm high x 160 mm front to back and 4 kg (plus additional 1 kg of weights and 500 mL of water coloring)
  • Packed Dimensions and Weight:
  • Approximately 0.11 m3 and 8 kg
  • Slotted weights:
  • 100 x 10 g
  • Weight hanger:
  • 2 off 10 g each
  • Accessories (included):
  • Water coloring
  • Syringe
 

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