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See Point Deductions & Fixes
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What your grader sees
EngineerCalc AI reviews your solution like a professor — flagging the specific mistakes that lose points.
Beam Deflection — Problem 3
Civil Engineering · Statics & Mechanics
Incorrect free body diagram — reaction forces at pin support missing horizontal component
Unit inconsistency — mixed kN and N in moment summation
Assumed beam is weightless without stating it — unsupported assumption
Deflection formula applied incorrectly — boundary condition for fixed end not satisfied
Correct approach & setup — moment equations properly applied at supports.
Before You Submit, Know What's Wrong
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ΣFx = 0: Ax = 0
ΣFy = 0: Ay + By = 500 N
ΣM_A = 0: By(4m) = 500(2m)
By = 250 N, Ay = 250 N
δ_max = PL³/48EI = 0.0023 m
What you think you'll get:
What actually happens:
− 8 pts: Missing horizontal reaction component at pin
− 5 pts: Deflection formula used for midpoint load, not distributed
ΣFx = 0: Ax = 0 ✓
ΣFy = 0: Ay + By = 500 N ✓
ΣM_A = 0: By(4m) = 500(2m)
By = 250 N, Ay = 250 N ✓
⚠ Pin support requires Ax — re-check horizontal equilibrium
⚠ Use distributed load formula: 5wL⁴/384EI
Issues caught before grading:
✓ Fixed reaction force diagram
✓ Corrected deflection formula
Estimated Submission Score
Know your predicted grade before your professor sees it.
78%
Estimated Score
Medium
Confidence
Top issues likely to lose points
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