34 ESSAYS AND OBSERVATIONS 



ed into different fleps. The firft is, that, 

 by a certain degree of refillance, a pro- 

 portion of the momentum or force of the 

 impinging body is deftroyed, and con- 

 fequently of its velocity. The next ftep 

 is, that, with the remaining force and 

 Telocity, an impulfe is made upon the 

 body at reft, which now refifls no long- 

 er, whereby it begins to move with the 

 remaining velocity of the impinging bo- 

 dy. And the lall ftep is, that it is carried 

 on with the fame degree of velocity by its 

 own vis infiia. 



From what is faid, it will be eafy to- 

 a<3juft the proportion betwixt the vis mo- 

 trix, and the refiftance of a body at reft. 

 For tho' refiftance and impetus are fo ef* 

 fentially different, as not to admit of a 

 coraparifon betwixt themfelves ; yet, the 

 effeCls produced by them are capable of 

 a comparifon. Now, the force loft by 

 the impinging body is a juft meafure of 

 the refinance of the body at reft ; and if 

 the momentum, before and after impulfe, 

 continue the fame y it muft follow, that: 



the 



