KAA110 - Engineering Statics
Lab Task 2: Hydrostatic Equili
ium
Formal lab report required.
Objective
To Study the hydrostatic pressure on a submerged plate
To predict the resultant force and moment of the hydrostatic pressure
To verify the predicted calculation with measured values
Equipment
A tank filled with wate
A rotating assembly containing a plate to be submerged in wate
A set of balancing weights that can slide on the assembly and can be fixed on the sliding rods
A protractor fixed on the tank to measure the rotation angle of the plate
A rule
Procedures
1. Measure the dimensions (width and depth) of the red plate and the tank, the radial distance
from the top edge of the plate to the axis of rotation, and the distance from the axis of rotation
to the water surface.
2. Balance the rotating assembly by adjusting the weights on the rods. The edge of the plate
should be just above the water’s surface when attempting to find equili
ium.
3. Record the location of the masses required to obtain equili
ium.
4. Submerge the plate in water to rotate the plate to the angle specified by the lab demonstrator.
5. Re-balance the assembly by adjusting the weights on the rod so that the angle of the plate in
the equili
ium position matches the provided value.
6. Record the new locations of the balancing masses to allow you to calculate the moment
equired to maintain equili
ium with the plate submerged.
7. Additionally record the depth of each edge of the red plate below the water surface
Report
A full formal lab report is required for the Hydrostatics Lab. You have two weeks from the lab
date to submit the lab report.
Your lab report should contain the following sections:
Summary
Introduction
Method
Results
Discussion
Conclusion
References
The Summary should concisely outline the lab aim, procedure, results and outcomes in 300 words or
less. A reader should be able to get a good idea of what was done and what they would find out if they
ead the full report.
An Introduction should provide context for the work conducted. Explain why is it important to
understand hydrostatic forces and moments. State the aims of the experiment and explain the theory
elevant to the lab.
Your Method section should introduce the experimental approach including a diagram of the
apparatus. Explain how it is used to obtain the experimental results. You should list and explain any
assumptions and the steps taken to ensure the results were reliable.
The experimental and theoretical results should be presented in the Results section in such a way that
a comparison between the theory and experimental data can easily be made (hint: a table might be
appropriate). Calculate and present the difference between the theoretical and experimental results for
discussion and interpretation later. Include an explanation of any result before presenting it and ensure
that tables and figures have appropriate captions.
Interpretation of results should occur in the Discussion section. It is important to list any e
or sources
and estimate their magnitude, but first discuss the experimental/theoretical data and what
understanding can be gained from it. Support any statement you make by refe
ing to your
experimental and theoretical data.
The text of your report should end with a Conclusion. In two or three sentences, recap the aim and
approach taken. Then state the main outcomes of the work – i.e. did theory successfully replicate the
experimental truth? And based on the experiments, to what accuracy could theory be used to predict
hydrostatic loadings? Were the e
ors small enough to be confident in the results?
Finally, you should list any references used in generating the report to properly acknowledge use of
work by others in Harvard style.
KAA110 - Engineering Statics Marking Ru
ic
Lab 2: Hydrostatic Equili
ium
Student Name: ________________________________________ Student Number:_________________________________________
Criteria 80-100% 65-80% 50-65% 0-50%
1. Predict and
analyse
experimental
esults,
30%
Accurately calculate the predicted results
ased on the selected coordinate system
and equili
ium equations.
Clearly interpret the measured results
Accurately calculate the differences
etween the predicted and measured values
and clearly present your comparison in a
table
Calculate the predicted results based on the
selected coordinate system and equili
ium
equations.
Interpret the measured results
Calculate the differences between the
predicted and measured values
E
or in predicted or measured results but
not both
Some insight into measured results given
Unexpectedly large e
ors identified
E
or in predicted and measured results or
esults missing
Little insight given into measured results
2. Apply
knowledge of
hydrostatics,
30%
Co
ectly and clearly draw a system diagram
with all critical features, including the
hydrostatic loading and the balancing forces
produced by the masses
Co
ectly express the distributed hydrostatic
load and present as a line load.
Co
ectly integrate the hydrostatic to
determine an equivalent force and moment
for the hydrostatic load and co
ectly
calculate the load centroid.
Clearly draw a system diagram including
most of the critical features.
Co
ectly express the distributed hydrostatic
load and present as a line load.
Integrate the hydrostatic to determine an
equivalent force and moment for the
hydrostatic load and calculate the load
centroid with only minor e
or.
Draw a system diagram including most of
the critical features.
Express as a function for the distributed
hydrostatic load and present as a line load.
Attempt to integrate the hydrostatic to
determine an equivalent force and moment
for the hydrostatic load and calculate the
load centroid.
System diagram not included or missing
critical features or is not legible
The hydrostatic load is not expressed as a
line load.
3. Present report
in a professional
manner,
40%
Co
ectly list any assumptions and factors
that may contribute to differences between
predicted and measured values
Test apparatus clearly sketched and other
diagrams to appropriate scale, all well
labelled
Concisely discuss observations
Co
ectly apply relevant knowledge in
discussing the results and your experience in
performing this experiment
Co
ectly use language without spelling and
grammar e
ors
List most important assumptions and factors
which contribute to differences between
predicted and measured values
Provide a sketch of the test apparatus and
some additional diagrams, all well labelled
Observations discussed with most important
points covered
Minimal spelling and grammar e
ors
Important assumptions not listed or some
inco
ect assumptions listed
A sketch is provided, but information is
missing or the sketch is poorly presented
Some meaningful observations made
Written work can be understood but has
spelling e
ors or poor grammar
Inco
ect assumptions listed or assumptions
not listed
Sketch not presented or of not legible
Observations not discussed
Sections of written work cannot be
understood.