Physics

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, spring force, tension in string etc, which all are e