54 INTRODUCTION TO GENERAL SCIENCE 



in the same way. Thus, when we study any natural law, we 

 must not for a moment think that nature has to act that way, 

 but simply that nature does act that way, and that in these 

 laws there never have been, and never will be, any exceptions. 

 The laws of motion are absolutely unalterable, and were 

 discovered and stated first by Sir Isaac Newton. They are, 

 therefore, called " Newton's Laws of Motion," but Newton 

 did not make them. His experiments showed him that 

 bodies in motion always behaved in a certain way, and he put 

 his observations into concise form and called them the " Laws 

 of Motion." 



References : 



1. 1002 : 145-147. The Laws of Motion. 



2. 1803 : 32-36. Newton's Laws cf Motion. 



a. 1001 : 72. The Law of the Earth's Motion. 



6. 1003 : 81-82. The Laws of Motion. 



c. 1801 : 29-31. The Laws of Motion. 



d. 1802 : 56. Newton's Laws of Motion. 



e. 1804 : 65-69. Newton's Three Laws of Motion. 

 /. 1805 : 49-50. The Laws of Motion. 



g. 1807 : 83-92. The Laws of Motion. 



h. 1808 : 39. Newton's Laws of Motion. 



i. 1809 : 65-72. Laws of Motion. 



j. 1810 : 36-37. Newton's Laws of Motion. 



Experiment 20. Inertia and Reaction. 



Apparatus: Card, coin, iron ball with screw eyes at the 

 two ends of a diameter, string, a piece of clock spring, two 

 small blocks of wood of unequal size. 



a. Balance coin on card on end of finger, and snap card 

 out. Coin will remain on finger, if care is used. If this is 

 found to be too difficult, place coin on card on corner of a 

 table, and knock the card off, horizontally. 



b. Support iron ball by small string and tie another piece 



