PROPERTIES OF MATTER 



A BIPLANE. 

 The blur shows how swiftly the propeller is revolving. 



moving in space. Once in motion they must keep on 

 forever unless some force stops them. 



Experiment 6. Place a 

 glass globe partly filled with 

 water on a rotating appa- 

 ratus. Rotate the globe 

 rapidly. What does the 

 water tend to do ? 



Inertia also manifests 

 itself in the tendency 

 of revolving bodies to 

 move away from the 

 center around which they are revolving. Inertia thus 

 manifesting itself is called centrifugal force. An ex- 

 ample of this was seen in Experiments 8 and 5. 



Fig. 4. 



