ðə fˈɜːst ɪz ðætðɪ ɐmˈaʊnt ʌv tˈoːɹk ðæt kæn biː tɹænsfˈɜːd ɪz ɐ fˈʌŋkʃən ʌvðə kˈɑːntækt pˈætʃ bᵻtwˌiːn ðə tˈuː dˈɪsks, ænd ðˈʌs ɐ fˈʌŋkʃən ʌvðə wˈɪtθ ʌvðə lˈoʊd dˈɪsk.
The first is that the amount of torque that can be transferred is a function of the contact patch between the two disks, and thus a function of the width of the load disk.