What are Scalar and Vector Quantities?
|♦ On the basis of direction and magnitude physical quantities are categorized into two groups. they are ..
• 1. Scalar Quantity
• 2. Vector Quantities
| ♦ Scalar Quantity
◘ A Scalar quantity is a quantity that has _
• Only magnitude.
• But no Direction◘ Example
• Electric Current
• Specific Heat
| ♦ Vector Quantity
◘ A vector quantity is a quantity that has _
• Both a magnitude and a direction.
• It follows the vector algebra rules for the performance of operations. e.g – triangle law or parallelogram law of vector addition.◘ Example :-
• Magnetic Field
• Current density
• Electric Field
• Angular velocity
How to represent Scalar and Vector quantity
◘ Scalar Quantity
◘ Vector Quantity
• A vector quantity denoted by – Bold face letter or symbol
• A vector is also represented by a bar or an arrow placed over the letter.
• Example of physical quantities that are represented by vectors are ….
• The magnitude of a vector is also represented by modulas function.
Difference between Scalar and Vector quantities
|It has only magnitude, but no direction.||It has both magnitude and direction.|
|Scalar quantity can divide another scalar quantity||Two vector quantities cannot be divided.|
|Every scalar quantity is one dimensional.||Vector quantity can be one (e.g UnitVector), two(e.g Force) or three dimensional (e.g Impuls).|
|Any changes in scalar quantity only affects the magnitude of the quantity.||Any Changes in vector quantity may affect the magnitude or direction of the vector or both magnitude and direction may affected .|
|It follows the ordinary algebraic rules like addition, multiplication and subtraction||It follows the vector algebra rules for the performance of operations.|
Similarities between Scalar and Vector Quantities
|• A certain physical quantity is represented by both scalar and vector quantity.
• Both have a specific dimension and unit.
• By using a suitable instrument we can measure both the quantities.
• Both the quantity holds a certain finite magnitude.
• Both scalar and vector quantities can be represented by a numerical magnitude corresponding unit.
|♦ More Related Topics
• Units and Measurements
• Units / System of Units