STATICS. 



MTU; i. 



INlK'-M't TI<N. 



A BODY IB a portion of matter limited in erery direction, 

 is connci, f a det< 



material particle w a body indefinitely email in every direc- 

 tion ; wo shall speak of it for shortness as a particle. 



xly i8 in motion when the body or its parts 

 successively different positions in space. But we 

 judge of the state of rest or motion of a body without 

 paring it with other bodies, and for this reason all 

 ii come under our observation are necessarily 

 motions. 



8. Force is that which produces or tends to produce motion 

 in a body. 



-everal forces act simultaneously on a bodr, it 

 may happen that they neutralise each other; when a body 

 remains at rest though acted on by forces, it is said to be in 



or, in other words, the forces are said to main- 

 tain equilibrium. 



5. Mechanics is the science which treats of the laws of 

 rest and motion of bodies. Statics treats of the laws of the 

 i bodies, and Dynamic! of the laws of motion of 

 bodies* 



re are three things to consider in a force acdn* 

 on a particle : the /XI*/K>JI of the particle : the 4tr*X*m of 



1 



