Equilibrium of bodies

Class x > Physics > Force

Definition of equilibrium

  • When a number of forces acting on a body do not change the state of rest or motion of the body, the body is said to be in equilibrium.

Kind of equilibrium

  • Static  equilibrium
  • Dynamic equilibrium

(i) Static equilibrium: When the body remains in the state of rest under the influence of several forces, the body is said to be in static equilibrium.

(ii) Dynamic Equilibrium: When the body remains in the state of motion under the influence of several forces, the body is said to be in dynamic equilibrium.

Conditions for equilibrium

(i) The resultant force acting on the body should be zero.

(ii) The algebraic sum of moments of forces acting on the body about the point of rotation should be zero.

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