Physics

The change in position vector of the particle for a given time interval is known as its displacement. AB = r = r2 - r1 Displacement is a vector quantity and its SI unit is meter. It can decrease with time. For a moving particle in a given interval of time  Distance can be a many-valued function but displacement would be always a single-valued function.  Displacement can be +ve, -ve or 0 but distance would be always +ve.  Distance ≥ Magnitude of displacement.  Distance is always equal to displacement only and only if particle is moving along a straight line without any change in direction Average speed and average velocity :-   Average speed and average velocity are always defined for a time interval.       Average speed (v) = Total distance travelled / time interval                            ...

An object is said to be in motion with respect to a frame of reference s1, when its location is changing with time in same frame of reference s1. Rest and motion are relative terms. Absolute rest and absolute motion have no meaning. Motion is broadly classified into 3 categories : 1. Rectilinear and translatory motion. 2. Circular and rotatory motion. 3. Oscillatory and vibratory motion.      Rectilinear or 1-D Motion When a particle is moving along a straight line, then its motion is a rectilinear motion. Parameters of rectilinear motion or translatory motion or plane motion: Time    It is a scalar quantity and its SI unit is second(s). At a particular instant of time, a physical object can be present at one location only. Time can never decrease.   Position or location It is defined with respect to some reference point (origin) of given frame of reference.    Consider a particle which moves from location r1 (at time t1) to...

Concept of Physics Part-1 (2018-2019 Session) by H.C Verma Paperback – 2017 by H.C. Verma (Author) Concept of Physics Part-2 (2018-2019 Session) by H.C Verma Paperback – 2017 by H.C. Verma (Author) About the Author Harish Chandra Verma is a Nuclear Experimental Physicist and author. H C Verma wrote other books like Industrial Families in India, Foundation Science: Physics For Class 9, Dominion Status vs Complete Independence etc. H C Verma got his Doctoral degree from the Indian Institute of Technology Kanpur. He went on to work as a lecturer and reader at the Patna University. As a physicist, his chief areas of interest are in Materials Applications, Condensed Matter and also on Earth Science related issues like extinction boundaries and meteorites. At present he is working on a book on Electromechanics.

A force is a push and pull in a particular direction. Force is a vector quantity and its SI unit is newton (N). For force, the following  two questions are very important:    (a) Which agent exerted this force ?    (b) On which object this force was exerted ? For, example, if a person is standing in a storm, then he feels that a force is acting on him. Wind exerts force on the person and person experiences this force.  - With every force, point of application is associated.  - Each force that is exerted on an object is caused by a particular body in its environment. Like in above example, wind is exerting force on the person. Force are classified in four categories:  (a) Gravitational force  (b) Electromagnetic force  (c) Nuclear force  (d) Weak force We will discus about these forces, in detail in the corresponding units of the Focal Points. In mechanics, we will mainly deal with contact forces, friction forces...

P hysics is the natural science that involves the study of matter and its motion through space and time, along with related concepts such as energy and force. One of the most fundamental scientific disciplines, the main goal of physics is to understand how the universe behaves.