Engineering Board Exam Reviewer · Engineering Mechanics · hard
In dynamics, D'Alembert's principle allows a dynamic problem to be treated as a static equilibrium problem by introducing:
- An additional external force equal to the weight
- A moment equal to the angular momentum
- A fictitious inertia force equal to -ma, opposite to the direction of acceleration
- A virtual displacement in the direction of motion
Answer
C. A fictitious inertia force equal to -ma, opposite to the direction of acceleration
Solution
D'Alembert's principle restates Newton's second law as F - ma = 0, treating -ma as an inertia force so the system can be analyzed using the methods of statics.
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