THE EEASCN WHY. J91 



** Be ye therefore followers of God, as dear children ; and walk in love, as Christ 

 also hath loved us." EPHESIANS v 



the top is accordingly thrown forward, and the kite is made to lie 

 obliquely upon the current of air moving against it. The kite then 

 being drawn by the string in one direction, and pressed by the 

 air in another direction, moves in a line which describes a 

 medium between the two forces acting upon it. 



841. Why does the kite-string feel hot when running 

 through the hand? 



Fig. 83. DIAGRAM EXPLAINING THE FLIGHT OF A KITE. 



Because the rapid friction sets free the latent heat of the 

 firing, attracts the heat of the hand to the spot where the 

 friction occurs, and sets free the latent heat of the air, which 

 follows the string through the hand, and is compressed by the 

 friction. 



842. Why does running with the kite cause it to rise 

 higher ? 



Because it increases the force with which the wind strikes upon 

 the surface of the kite. If a person were to run with a kite at the 

 rate of five miles an hour, through a still air, the effect would be 

 equal to a windjlying at the rate of jive miles an hour against a 

 kite held by a stationary string. 



843. Why does the flying-top rise in the air ? 



Because its wings meet the air obliquely, just as the surface of 

 the kite does. And the ticirling of the top, causing the oblique 



