2 INTRODUCTION. [4. 



Kinetics. In statics those cases are considered in which no 

 change of motion is produced by the acting forces, or, as it is 

 commonly expressed, in which the forces are in equilibrium. 

 The investigations of statics are therefore independent of the 

 element of time. Kinetics treats in the most general way of 

 the changes of motion produced by forces. 



