Rajdeep
Last Activity: 6 Years ago
HELLO THERE!
Scalar Quantity: A physical quantity, which has only magnitude and no direction, is known as scalar quantity. For example, when you ask about the speed of a car, we say “it is 25 km/h”. When you ask about time, we say “it is 9 o’ clock”. We do not say “It is 9o’ clock east or 9o’ clock North (which actually does not make any sense)”.
Vector Quantity: A physical quantity which has both magnitude and direction, and follows the triangle law of Addition or equivalently, the Parallelogram law of Addition is known as Vector quantity.
For example, when you ask about the position of someone’s house, and we say “It is 10km”, you cannot exactly find out the house. We need to specify a direction too, like “It is 10km North, or 10km West”.
Unit Vector is a vector which has its magnitude one (1). According to the Cartesian coordinate System, the three unit vectors are i (along positive X axis), j (along positive Y axis), and k (Along the positive Z axis).
Considering an unit vector A,
A = A vector / Magnitude of A vector.