6.5 Equilibrium Problem Equilibrium Definition A system is said to be in equilibrium if it remains stationary under the action of applied forces i=9=0 Dynamic equation M9+Φ，'=2 i=0 Equilibrium equation D,九=q  q  0 T A Mq q   Q T A  q   Q A system is said to be in equilibrium if it remains stationary under the action of applied forces Equilibrium Definition Dynamic equation Equilibrium equation q  0 6.5 Equilibrium Problem