CONTENTS. 



CHAPTER III. 

 INTRODUCTION TO DYNAMICS. 



I. MASS; MOMENTS OF MASS; CENTROIDS: 



1 . Mass ; density 1 



2. Moments and centres of mass 4 



3. Examples of the determination of centroids . . . u 



II. MOMENTUM; FORCE; ENERGY 34 



CHAPTER IV. 

 STATICS. 



I. INTRODUCTION 45 



II. CONCURRENT FORCES 54 



III. PARALLEL FORCES . . . 59 



IV. THEORY OF COUPLES . . |- 76 



V. PLANE STATICS : 



1. The conditions of equilibrium . . . . -83 



2. Stability. . . . , v . .- . . .92 



3. Jointed frames . . . ... .. 99 



4. Graphical methods IO 3 



5. Friction . . . 109 



vii 



