Mr.All-Engineering Guide

  ENGINEERING MECHANICS  STATICS AND DYNAMICS Part - 2 Chapter 1. General Principles Author:- Jakkir Hussain.  1.3 Units of Measurement The four basic quantities-length, time, mass, and force are not all independent from one another, in fact, they are related by Newton's second law of motion, F = ma Because of this, the units used to measure these quantities cannot all be selected arbitrarily. The equality F = ma is maintained only if three of the four units, called base units, are defined and the fourth unit is then derived from the equation. SI Units : The International System of units, abbreviated SI after the French "Système International d'Unités," is a modern version of the metric system which has received worldwide recognition. As shown in Table 1-1, the SI system defines length in meters (m), time in seconds (s), and mass in kilograms (kg). The unit of force, called a newton (N) is derived from F = ma Thus, I newton is equal to a force required to give 1 kilog...

ENGINEERING MECHANICS  STATICS AND DYNAMICS Chapter 1. General Principles Part - 1  Mechanics ,  Fundamental Concepts Author:- Jakkir Hussain.  CHAPTER OBJECTIVES ◆ To provide an introduction to the basic quantities and idealizations of mechanics. ◆ To give a statement of Newton's Laws of Motion and Gravitation. ◆ To review the principles for applying the Sl system of units. ◆ To examine the standard procedures for performing numerical calculations. ◆ To present a general guide for solving problems. 1.1 Mechanics Mechanics is a branch of the physical sciences that is concerned with the state of rest or motion of bodies that are subjected to the action of forces. In general, this subject can be subdivided into three branches: rigid-body mechanics, deformable-body mechanics, and fluid mechanics. In this book we will study rigid-body mechanics since it is a basic requirement for the study of the mechanics of deformable bodies and the mechanics of fluids. Furthermore, r...