Physics

Rigid Body * A rigid body is a ‘system of particles’ with a finite size that do not get deformed under the influence of any external force. * The distance between ant two particles of an ideal rigid body does not change even when it is under the influence of external forces. * The motion ... Read more

Work Energy Theorem * The dot product of two vectors is equal to the product of the magnitude of the two vectors and cosine of the angle between the two vectors. The result of a dot product is always scalar. * Using the dot product, the work done is measured as the dot product of ... Read more

* Kinetics is the study of the displacement, velocity and acceleration of a body in motion along with the forces responsible for the motion. * A force applied by an external agency either accelerates or retards a body. * The tendency of a body moving with uniform velocity in a straight line to stay in ... Read more

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