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Scalars and Vectors Introduction | Triangle Law of Vectors | Physics Grade XI

Triangle Law of Vectors

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Scalars and Vectors Introduction | Triangle Law of Vectors | Physics Grade XI

Scalars and Vectors Introduction | Triangle Law of Vectors

Terms regarding vector

  • Unit vector: A vector having magnitude of unity is called unit vector.
  • Null (or zero vector) vector: The vector having no magnitude is called Null vector.
  • Parallel Vectors: Two vectors having same direction are called Parallel vectors.
  • Equal vectors: Two vectors having same magnitude and direction is called equal vectors.
  • Negative of a vector: Two vectors having same magnitude but acting opposite in direction is called negative of a vector.
  • Collinear vectors: Vectors having an equal or unequal magnitude but acting along the parallel straight lines are called collinear vectors.
  • Coplanar vectors: Vectors lying on the same plane are called Coplanar vectors.

Difference between Scalar and Vector Quantities

Scalar

Vector

Scalar quantities change with the change in magnitude only

Vector quantities are specified by both magnitude and direction

Scalar quantities change with change in magnitude only

Vector quantities change either with the change in magnitude or with the change in direction or with the change of both magnitude and direction

Scalar quantities with same units can be added or subtracted according to the ordinary rules of algebra

Vector quantities cannot be added or subtracted algebraically

These are represented by ordinary letters

These are represented by bold-faced letters or letters having an arrowhead.

Triangle Law of VectorsMagnitude and Direction of R

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