Non-central forces (i.e., those that depend on the angular variables as well as the radius) are ignored here, since they do not produce circular orbits in general.
nˈɑːnsˈɛntɹəl fˈoːɹsᵻz ˈaɪ.ˈiː., ðoʊz ðæt dᵻpˈɛnd ɔnðɪ ˈæŋɡjʊlɚ vˈɛɹɪəbəlz æz wˈɛl æz ðə ɹˈeɪdɪəs ɑːɹ ɪɡnˈoːɹd hˈɪɹ, sˈɪns ðeɪ duːnˌɑːt pɹədˈuːs sˈɜːkjʊlɚɹ ˈɔːɹbɪts ɪn dʒˈɛnɚɹəl.