“…Students having difficulty to understand the concept (Kareth, Dahlan, and Akbar 2018)(Obafemi and Onwioduokit 2013) (Iradat and Alatas 2017), due to students not actively construct knowledge in their own mind (Obafemi and Onwioduokit 2013) to build his own knowledge required skills, include science process skills (Ilmi, Desnita, Handoko, and Zelda 2016).. While the facts of physics learning activities has not been optimally trained the students" process skills (Ramayanti, Utari, and Puzaman 2017), as evidenced by the students' science process skills is low (Irwanto, Rohaeti, Widjajanti, and Suyanta 2017) (Rahayu, Pratiwi, and Indana 2018) (Sukarno, Permanasari, and Hamidah 2013). Lack of discovery learning makes students' science process skills is low (Lati, Supasorn, and Promarak 2012).…”