ENGINEERING MECHANICS STATICS AND DYNAMICS Chapter 1. General Principles Part - 2

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...