Discussion
D'Alembert's principle allows a dynamic problem to be written as an equilibrium problem by introducing
Answer: B
Correct answer: a fictitious inertia force opposing the acceleration
D'Alembert's principle adds an inertia force of magnitude \( m\ddot{u} \) acting opposite to the acceleration, after which the system may be treated as though it were in static equilibrium.
The advantage is method rather than physics: the whole apparatus of statics - free bodies, equilibrium equations, virtual work - becomes available for a dynamic problem. The force is fictitious in the sense that no external agent applies it; it is the mass's resistance to acceleration written as though it were a load.
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