##  [D'Alembert's Principle](/index.php/dalemberts-principle) 

  ##  [D'Alembert's Principle](https://engineering.quantumdictionary.io/dalemberts-principle-0) 

  

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**Engineering & Applied Technologies Dictionary**

 







 

 

 

 



 

 

 

 

Definition

A reformulation of dynamics stating that, for a mechanical system, inertial effects may be represented as additional applied (fictitious) forces equal to minus mass times acceleration so that the instantaneous equations take the form of a static equilibrium (sum of applied forces plus inertial forces equals zero), enabling virtual work or equilibrium methods to be applied to dynamic problems.