i.vs 



CENTRIFUGAL FORCE 



CH, IX 



it round the turn ; it has, however, a tendency to 

 keep on in the straight line, and this tendency is 

 shown as a force acting- at right angles to the 

 direction of the coach, pulling it outward from the 

 circle in which it is moving. This is called the 

 centrifugal force, and acting as it does upon each 

 particle of the vehicle, the sum of these numberless 

 forces acts as if it were concentrated at the centre 

 of gravity ; and it evidently acts in a direction to 

 overturn the coach ; moreover, the higher it is ap- 

 plied, the more effect it will have (see Fig. 68). 

 This force is opposed by the weight of the coach 

 which, acting downward through G, keeps the 

 coach to the ground. 



The centrifugal force varies exactly with the 

 weight ; increasing the actual weight does not in- 

 crease the stability, but diminishing the height of 

 the point, at which the centrifugal force is applied, 

 does increase it. 



In the diagram, Fig. 69, the black spot indicates 



Fig. 69. 



the weight of the coach concentrated at the centre of 

 gravity, C is the centrifugal force acting horizontally 

 outward, at G ; the weight is acting vertically down- 



