Scenario 1: Outcomes-Based Education in a Capstone Project

Example

Question: A final-year team is designing a pedestrian bridge. How should an outcomes-based program evaluate the work?

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Scenario 2: Static Friction and Impending Motion

Example

Question: A 500 N box rests on a horizontal floor. If the coefficient of static friction is μs=0.40\mu_s=0.40, what horizontal force corresponds to impending motion?

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Supplemental mechanics lab

Equilibrium, Static Friction, and Sliding

Increase the horizontal applied force and observe the transition from static equilibrium to sliding on an ideal horizontal surface.

Model assumptions: horizontal rigid surface, no vertical applied-force component, constant coefficients, and μk ≤ μs. Real contact behavior can be more complex.

Current state

Static equilibrium

Static friction adjusts to match the applied force, up to its limiting value, so the horizontal net force remains zero.

Weight W
490.5 N
Normal N
490.5 N
Max static friction
196.2 N
Actual friction
120.0 N
Horizontal net force
0.0 N
Acceleration
0.00 m/s²

W = mg = 50 × 9.81 = 490.5 N

fₛ,max = μₛN = 0.40 × 490.5 = 196.2 N

fₛ = P = 120.0 N while P ≤ fₛ,max

Scenario 3: Beam Reactions as a Verification Exercise

Example

Question: A simply supported 10 m beam carries a 50 kN downward point load at midspan. Neglect beam self-weight. Find the vertical reactions.

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Scenario 4: Normal Stress Is Not a Complete Design Check

Example

Question: A solid circular steel rod with diameter 20 mm20\text{ mm} carries a concentric tensile force of 40 kN40\text{ kN}. What nominal axial stress develops, and can this result alone prove the member is safe?

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Scenario 5: Laboratory Evidence and Uncertainty

Example

Question: A concrete cylinder test result is lower than expected. Should a student immediately conclude that the entire concrete batch is defective?

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Key Takeaways
  • OBE aligns intended outcomes, learning activities, assessment evidence, and continuous improvement; it does not guarantee competence automatically.
  • Static friction adjusts to the applied force until the limiting value μsN\mu_sN is reached.
  • Equilibrium results should be checked using symmetry, force balance, and physical expectations.
  • A calculated stress is one piece of evidence, not an automatic declaration that a member is safe.
  • Laboratory testing contains sampling, procedural, and measurement uncertainty that must be documented and interpreted under the governing requirements.
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