This study aimed to investigate the effect of the online PhET simulation-assisted using the direct instruction on students’ conceptual understanding of the parabolic motion. It was quasi-experimental research with pretest-posttest control group design. The research subjects were 10th grade students, consisting of 20 students for each experimental and control groups. The data were collected using a concept understanding test. The research data were analyzed quantitatively by using descriptive and inferential statistics. The results show that the average score of the experimental class was higher than the control class. The hypothesis was tested using Mann-Whitney (U-Test) with a significance level of = 0.05. Based on data analysis, it can be concluded that there was a significant effect of online PhET simulation assisted learning model on students’ concept understanding on parabolic motion.

Learning using interactive learning media aims to facilitate the learning process and foster teacher creativity and innovation in designing the learning process. Therefore, this research intends to develop a learning product in the form of interactive digital ebooks. The formulation of the problem in this study are: 1) What is the description of general learning media in the field of SKI in class IV? 2) How is the design of the Kibudi Book as an interactive digital learning media in the field of SKI in grade IV? 3) How are the results of the validity test regarding the Kibudi Books product as an interactive digital learning medium in the field of SKI in grade IV?. The model used is DD (design and development). The data obtained in the form of quantitative and qualitative by using two methods of data collection, namely observation and questionnaires. The results of the study show 1) Learning about SKI material in general only uses the lecture method with book media 2) The design of this digital interactive learning media includes three stages, namely; (a) needs analysis, (b) design, (c) development and implementation, 3) The results of the validity test regarding kibudi products include: (a) the results of a design and material expert review with very valid qualifications (100%). (b) the results of user reviews of teachers with very valid qualifications (85.71%), (c) results of user reviews of users with qualifications (97.05%) with very valid qualifications. So it can be used that the development of interactive digital learning media Kibudi Book is feasible in the learning process. Keywords: Learning Media, Isra Miraj, Kibudi Books.