ɐsˈuːm ðætðə fˈoːɹsᵻz ˈæktɪŋ ɔnðə bˈɔːl ɑːɹ ɡɹˌævɪtˈeɪʃən ænd ðə kˈɑːntækt fˈoːɹsᵻz ʌvðə tˈeɪbəl pɹɪvˈɛntɪŋ pˌɛnɪtɹˈeɪʃən.
Assume that the forces acting on the ball are gravitation and the contact forces of the table preventing penetration.