Vlll 



CONTENTS. 



VI. SOLID STATICS: 



1. The conditions of equilibrium 



2. Constraints 



PACK 

 121 

 I 3 2 



VII. THE PRINCIPLE OF VIRTUAL WORK 143 



VIII. THEORY OF ATTRACTIVE FORCES: 



1. Attraction I5 8 



2. The potential 169 



ANSWERS J 7 6 



