===== Vectors and Equilibrium =====

  - **Basic Concept of vectors**
  * Vectors.
  * Rectangular Coordinate system.
  * Addition of Vectors.
  * Resultant Vectors
  * Vectors Subtraction.
  * Multiplication of a Vector with a Scalar.
  * Unit Vector.
  * Null Vector.
  * Equal Vectors.
  * Rectangular Components of a Vector.
  * Determination of a Vector from its Rectangular Components.
  * Position Vector.
  - **Vector Addition by Rectangular Components**
  - **Product of two Vectors**
  * Scalar or Dot Product.
  * Vector or Cross Product.
  - **Torque**
  - **Equilibrium of Forces**
  * First Condition of Equilibrium.
  * Second Condition of Equilibrium.


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