Learning physics in SMA cannot be separated from students' critical thinking activities without delay. Critical thinking will not develop optimally if the learning still tolerates the direct learning model. One of the learning models that are accommodative in developing critical thinking is the problembased learning model. Both models can be used as pedagogical content for flipped learning, which is termed problem-based flipped learning (PBFL) and direct flipped learning (DFL). This study aims at describing the difference effect between PBFL and DFL on critical thinking (CT) viewed from students' academic procrastination (AP) in learning physics in SMA. Student's AP is a variable of sorting critical thinking skills based on low AP (LAP) and high AP (HAP). The study population was 6 classes of students of class XI SMAN 2 Semarapura. A sample of 4 classes was selected by random assignment technique, which then randomized again to determine 2 classes as PBFL class and 2 classes as DFL class. To collect the students' academic procrastination, the questionnaire is used. Students' critical thinking skills were collected by means of an essay test using a 4point scale. Data were analyzed using two-way ANACOVA with initial critical thinking skills scores as covariates. Hypothesis testing is carried out at the 5% significance level. The results showed 1) There was a significant difference in the effect between PBFL and DFL on CT (F = 11,769; p <0.05). Students' CT was higher achieved by students who studied with PBFL than them studied in the DFL model. 2) There is a significant difference in the effect between LAP and HAP on CT (F = 7.006; p <0.05). Higher CT rates were achieved by students who had LAP compared with them had HAP. 3) There is no significant interactive effect between the learning model and AP on CT (F = 1.451; p> 0.05). In learning physics class XI SMA, the two AP categories are accommodating to the PBFL and DFL models.
Keywords-problem-based flipped learning, direct flipped learning, critical thinkingRelated to the implementation of PBL in physics learning, it is showed very challenging findings, that although the critical