TYPES OF PHYSICAL QUANTITIES:
Physical quantities are divided into two types:
“Physical quantities which can completely be specified by a number (magnitude) having an appropriate unit are known as “SCALAR QUANTITIES”
Scalar quantities do no need direction for their description.
Scalar quantities are denoted by letters in ordinary type.
Scalar quantities are added, subtracted, multiplied or divided by the simple rules of algebra.
“Physical quantities having both magnitude and direction with appropriate unit are known as “Vector Quantities”.
We can’t specify a vector quantity without mention of direction
Vector quantities are expressed by using bold letters with arrow sign such:
Magnitude of vector is represented by only alphabets without arrow.
Vector quantities cannot be added, subtracted, multiplied or divided by the simple algebraic method.
Vector quantities added, subtracted, multiplied or divided by the rules of trigonometry and geometry.