Physics XI Content
Scalar and Vector – Introduction
Scalar quantities do not need direction for their description.
Work, energy, electric flux, volume, refractive index, time, speed, electric potential, potential difference, viscosity, density, power, mass, distance, temperature, electric charge, electric flux etc.
Physical quantities having both magnitude and direction
We can’t specify a vector quantity without mention of deirection.
Velocity, electric field intensity, acceleration, force, momentum, torque, displacement, electric current, weight, angular momentum etc.
REPRESENTATION OF VECTORS
On paper vector quantities are represented by a straight line with arrow head pointing the direction of vector or terminal point of vector.
A vector quantity is first transformed into a suitable scale and then a line is drawn with the help of the
scale choosen in the given direction.