 ## Rest and Motion

What is Rest ? If a body is not changing its position with respect to its environment. What is Motion? If a body is changing its position with respect to its environment. Types of Motion. Translatory Motion. Rotatory Motion. Vibratory… ## Speed

Speed Distance Covered by a body in unit time. Rate of change of distance. It is a scalar quantity. It is represented by v. Formula = Distance / Time v = s / t Speed unit = m / s… ## Physical quantity and Measurements

Physical Quantity A physical phenomenon that can be quantified is a physical quantity.It has any numeric value and unit. Unit It is the fixed amount of a physical quantity which is used as a standard of measurement. Fundamental / Base… ## Distance and Displacement

Distance Length of a Path between two points is called distance Unit = meter Displacement It is the shortest distance between two points Unit = meter Distance Displacement Length of a Path between two points. It is the shortest distance… ## Scientific Notation

What is scientific notation? What is standard notation? Why use scientific notation? Scientific notation in Urdu. Scientific notation in Hindi? scientific notation in standard notation. standard notation in scientific notation. scientific notation conversion. ## Newton Law of Gravitation and Gravitational Acceleration

Gravity: Gravity is the force by which a body attracts another body toward its center. Earth’s gravity comes from all its mass. If you were on a planet with less mass than Earth, you would weigh less than you do… ## Mirror and Its Types

Mirror   Mirror is a shiny and smooth surface, It has ability to reflect light to its originating medium. Topics Mirror. Plane mirror. Spherical mirror. Convex Mirror. Concave Mirror. Center of Curvature. Focal Length. Principal Focus. Pole. ## Reflection Of Light

Reflection Of Light When light travelling in one medium and strikes with shiny surface , a big part of  light is sent back to the same medium. 