73	 63, galileo measur us newton basi law motion
75	 45, galileo experi bodi roll slope act same forc weight effect make constantli speed up
70	 50, show real effect forc chang speed bodi set move previous thought
75	 50, meant bodi act forc keep move straight line same speed
65	 45, idea first state explicitli newton principia mathematica publish 1687 known newton first law
75	 50, happen bodi forc act given newton second law

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key    value
73     galileo measur us newton
75     galileo experi bodi
70     show real effect forc