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By Arthur L. Kimball

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14). he cord between P aDd B while CD repl'elleQUi the Itrell8 on AP, and DP represents the weight W. Evidently the more nearly AP and PH are to being in a straight line the larger will CD and PC be in comparison with the force W which is represented by DP. 80 that a eOffipamtively small pull down at P, if APB is nearly straight, may produce a force great enough to break the eonl between A and B. trese brought to bear on hammock ro~ may be mueh greater than the weight of thc person supported if it is hung with insufficient eag.

To make friction small the surfaces should be very hard and of fine even polish. Where tbere is much wear it is customary to make one of the bearing surfaces of a harder material than the other. Thus the crank pins on steam engines are made of polished steel and turn in br88S boxes, the friction between the br888 and steel being less than it would be between two parts of steel. Rolling friction is very much less than slidingfrictioD, therefore, wheels are used on carriages, etc. It depends to some extent on the qiameter of the wheels, being less when the diameter is greater.

A P is, therefore, the center of gravity of M m and m. Now conceive the masses M and r P m concentrated at P and find similarly a A M Vi> V point P' through which the resultant weight "- 8 of (M +m) and of another mass m' must always pass. Continue in this manner until FlO. 28. account has been taken of all the masses into which we may conceive the body to have been subdivided. The point through which the final resultant passes is the center of gravity of the body. 60. -The center of gravit~ as has just been explained is determined by the distribution of mass in a body or system of bodies.

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