DCP

The quantities like: mass, time, volume and energy which can be completely defined by stating their magnitudes, and which do not have any direction. Such quantities are called scalar quantities . On other hand quantities like: displacement, velocity, acceleration, momentum and force posses both magnitude as well as direction. To define these quantities we have to specify their (a) magnitude, (b) direction and (c) point of action. Such quantities are called vector quantities .

Unit is defined as the numerical standard used to measure the qualitative dimension of a physical quantity. Mass or Force, Length and time are accepted as basic quantities, then all other quantities are derived quantities.   ü   S YSTEM   OF UNITS          FPS   : foot, pound, second          CGS : centimeter, gram, second          MKS : meter, kilogram, second          SI      : System International ü   SI UNITS Accepted throughout the world and is a modern version of the metric system. Length   -   metres (m), Mass   -   kilograms (kg), Time   -   seconds (s)   are selected as the base units and Force in newtons (N) is derived from Newton’s Second law. Electric Current – Ampere (A) Temperature       - Kelvin (K) Amount of substance – mole (mol) Luminous intensity – Candela (cd)

Applied mechanics is a branch of the physical sciences and the practical application of mechanics. Applied mechanics examines the response of bodies (solids and fluids) or systems of bodies to external forces . Some examples of mechanical systems include the flow of a liquid under pressure, the fracture of a solid from an applied force, or the vibration of an ear in response to sound. A practitioner of the discipline is known as a mechanician. Applied mechanics, as its name suggests, bridges the gap between physical theory and its application to technology. As such, applied mechanics is used in many fields of engineering, especially mechanical engineering. In this context, it is commonly referred to as engineering mechanics. Much of modern engineering mechanics is based on Isaac Newton 's laws of motion while the modern practice of their application can be traced back to Stephen Timoshenko , who is said to be the father of modern engineering mechanics. Typically, eng