Matter and Motion. 13 



the greater the time,and the less the space 

 moved over, th*. less is the velocity* Ev- 

 ery body in motion must have a determi- 

 nate velocity. To ascertain the degree 

 of this swiftness or velocity, the space 

 run over must be divided by the time. 

 For example, suppose a body moves over 

 1000 yards in 10 minutes, its velocity 

 will be 100 yards per minute, because 

 100 is the quotient of 1000, divided by 

 10. If we would compare the velocity 

 of twu bodies A and B, of v.hich A 

 moves over 54 yards in 9 minutes, and 

 B 96 yards in 6 minutes, the velocity of 

 A will he to that of B, in the proportion 

 of 6 (the quotient of 54 divided by 9) to 

 16 (the quotient of 96 divided by 6.) 



To know the space run over, the velo- 

 city must be multiplied by the time ; for 

 it is evident, that if either the velocity or 

 the time be increased, the space run over 

 will be greater. If the velocity be doub- 

 led, then the body will move over twice 

 the space in the same time ; or if the 

 time be twice as great, then the space 

 will be doubled : but if the velocity and 

 time be both doubled, then will the 

 be four times as great, 



