Gravitasi: Pabidaan ralatan

Panalitian modern dalam teori gravitasi ditambai lawan gawian [[Galileo Galilei]] di pahabisan abad ka-16 lawan pamulaan abad ke-17. Lawan hasil panaraiannya manggugurakan bal matan [[Menara Pisa]], wan kainahnya jua paukuran bal nang mangunyur melalui [[Bidang miring|kamiringan]], Galileo manampaiakan bahwa ganalnya percepatan gravitasi adalah sama gasan sabarataan objek. Hal naya jadi kemajuan ganal matan kaparcayaan [[Aristoteles]] sabalumnya nang manyambat bahwa objek nang tabarat baisi palajuan gravitasi nang taganal.<ref>[[Galileo]] (1638), ''[[Two New Sciences]]'', [http://oll.libertyfund.org/?option=com_staticxt&staticfile=show.php%3Ftitle=753&chapter=109891&layout=html&Itemid=27 First Day] Salviati speaks: "If this were what Aristotle meant you would burden him with another error which would amount to a falsehood; because, since there is no such sheer height available on earth, it is clear that Aristotle could not have made the experiment; yet he wishes to give us the impression of his having performed it when he speaks of such an effect as one which we see."</ref> Galileo membuatmaulah postulat hambatan udara sebagaisawagai alasan objek denganlawan massa kecilhalus memungkinkankawa untukgasan jatuhgugur lebih pelantagalai di atmosfer. Hasil kerjagawian Galileo menjadimanjadi dasar bagigasan formulasi teori gravitasi Newton.<ref>{{cite book|url=https://books.google.com/books?id=Cc6lBQAAQBAJ|title=Quantum Theory: A Mathematical Approach|first1=Peter|publisher=Springer|year=2014|isbn=978-3-319-09561-5|edition=illustrated|page=11|last1=Bongaarts}} [https://books.google.com/books?id=Cc6lBQAAQBAJ&pg=PA11 Extract of page 11]</ref>