Notes

Scalars and vectors * Rectilinear motion is motion that occurs in a straight line. * Entities that are described completely with the help of a number along with its unit are called scalars * A number along with the unit that represents the measure of a physical quantity is called its magnitude. * Mass, distance, ... Read more

Position, path length and displacement * Displacement is the change in the position of the body. Average velocity and average speed * Speed is a scalar whereas velocity is a vector. * The average velocity is the ratio of the change in position or displacement and the time interval in which the displacement occurs. * ... Read more

International system of units * A unit is an internationally accepted basic reference standard against which the measurements of any physical quantity are compared. * The units of fundamental or base quantities are called base units or fundamental units. * The units of derived quantities, expressed as a combination of base units are called derived ... Read more

Physics Importance and Scope * Physics is the branch of science that deals with the natural phenomena in terms of basic laws and physical quantities. * The scope of physics can be divided into two major domains that are, macroscopic and microscopic. * The macroscopic domain deals with phenomena at laboratory, realistic, terrestrial and astronomical ... Read more