I46 CENTRIFUGAL FORCE CH. IX 



much smaller inclinations ; and the lower the centre 

 of gravity compared with the width of the base 

 the greater will be the stability at any speed, or 

 on any curve. 



It must be also noticed that the load of the coach 

 has been supposed to be in the centre ; if it should 

 be moved over to the inside of the turn, its re- 

 sistance to the action of the centrifugal force (by 

 increasing the length of AB, Fig. 69) will be in- 

 creased ; if it is moved to the outside, its resistance 

 will be correspondingly diminished. 



If the surface of the road is slippery, a coach, 

 under the influence of a centrifugal force much less 

 than is required to turn it over, will slide bodily 

 sideways, and if it brings up suddenly against an 

 obstacle or in the gutter, it may be upset. 



