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Dynamic Equilibrium Demystified

Confused about dynamic equilibrium? If your textbook says ΣF = 0 but the object is clearly accelerating, this free mini-course explains exactly what's going on. In 4 short lessons, understand D'Alembert's Principle, the 'inertial force' trick, and how it connects to equations of motion and transfer functions in control systems. Perfect for students studying from Nise's Control Systems Engineering. Built by MakeSense AI.

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100% free — no credit cardNo signup required to readAI-generated, expert-level content4 lessons · ~29 min

What you'll learn

Concrete skills and knowledge you'll walk away with.

State Newton's Second Law and explain what 'net force' physically means

Explain D'Alembert's Principle as a rearrangement of F = ma, not a new physics law

Clarify why the 'inertial force' (−ma) is a fictitious bookkeeping term, not a real force

Resolve the paradox: 'equilibrium' here means the equation balances, not that nothing moves

Draw a free body diagram for a mass-spring-damper system using D'Alembert's approach

Write the equation of motion by summing forces (including the −ma term) and setting equal to zero

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Lesson 1Free

F = ma Is Not About Equilibrium

Back to basics: what Newton's Second Law actually says. The left side (forces) causes the right side (acceleration). This is the real physics — and there's no 'zero' anywhere.

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Course Curriculum

Newton vs. D'Alembert

F = ma Is Not About EquilibriumFree preview
🔒D'Alembert's Trick: Move ma to the Other Side

Applying It to Real Systems

🔒Free Body Diagrams the D'Alembert Way
🔒From Equation of Motion to Transfer Function

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Dynamic Equilibrium Demystified

4 lessons · ~29 min · completely free

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