THE CENTER OF GRAVITY 57 



References : 



1. 1002 : 194-200. The Law of Gravitation. 



2. 1304 : 8-9. Gravity and Gravitation. 



3. 1803 : 20-21. Newton's Law of Universal Gravitation, 

 a. 1001:51. Gravity. 



6. 1801 : 48. Law of Universal Gravitation. 



c. 1802 : 86. Law of Universal Gravitation. 



d. 1804 : 118-121. Universal Attraction between Masses. 



e. 1805:48-49. Gravitation. 



/. 1806 : 91-92. Direction of Gravitation and Center of 



Gravity. 



g. 1807 : 98-99. Universal Gravitation. 



h. 1808:60-61. Gravitation and Gravity. 



i. 1809 : 110. Newton's Law of Universal Gravitation. 



j. 1810 : 33-34. Universality of Gravitation. 



k. 1811:330-335. Gravitation. 



40. THE CENTER OF GRAVITY 



The center of gravity is the point which, if supported, will 

 prevent the entire body from falling. It may also be defined 

 as that point where we may consider all the weight of the 

 body located. In a sphere it is at the center; with an irregu- 

 lar body the center of gravity may be entirely outside the 

 body. 



The center of gravity of a small body may be located by 

 suspending the latter by a string. If the string is imagined 

 to be prolonged into the body, it will pass through the center 

 of gravity. By supporting the body from at least three dif- 

 ferent points, the center of gravity is definitely determined. 



References : 



1. 1803 : 22-23. Center of Gravity and Method of Finding It, 

 a. 1801 : 48-49. Center of Gravity. 

 6. 1805 : 50. Center of Gravity. 



