John Philoponus (in Late antiquity) and Galileo (in Early modern period) are said to have shown by experiment that Aristotle's claim that a heavier object falls faster than a lighter object is incorrect.
dʒˈɑːn fˈɪləpˌoʊnəs ɪn lˈeɪt æntˈɪkwᵻɾi ænd ɡˌælᵻlˈeɪoʊ ɪn ˈɜːli mˈɑːdɚn pˈiəɹɪəd ɑːɹ sˈɛd tə hæv ʃˈoʊn baɪ ɛkspˈɛɹɪmənt ðæt ˈæɹɪstˌɑːɾəlz klˈeɪm ðˌæɾə hˈɛviɚɹ ˈɑːbdʒɛkt fˈɔːlz fˈæstɚ ðˌænə lˈaɪɾɚɹ ˈɑːbdʒɛkt ɪz ɪŋkɚɹˈɛkt.