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Vector Quantities.

A vector quantity is a quantity that has both magnitude(size) and direction.Distance is a scalar quantity, but displacement is a vector quantity. Displacement is distance in a particular directionSpeed is a scalar quantity, but velocity is a vector quantity. Velocity is speed in a particular direction.Vectors in one dimension are either parallel

or anti-parallel.

They can be added, and the vector sum found.
The sum of multiple vectors is called the resultant vector.

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Specification: OCR Physics A (H156), AS-level, 2.3.1 Scalars and vectors. Topic: Quantities and Units.

Key terms in this lesson

scalar quantity
A quantity that has magnitude only, with no direction.
displacement
The distance an object has moved in a straight line from its starting point, in a particular direction.
velocity
The rate of change of displacement of an object; speed in a given direction.

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