Rotational Dynamics is one of the physics subjects which is quite difficult for students. Several previous studies have shown students' difficulties on this topic. So, it causes students to experience misconceptions. Therefore, the purpose of compiling this article is to: (1) discover the causes and types of misconceptions; (2) know the methods, models, and media for learning physics on dynamic rotation and equilibrium of rigid bodies. The research method used is a literature review, with the keyword rigid body mechanics. In the results, there are several types of learning methods, models, and media, some examples are discovery learning models, problem-based learning models, scientific-based learning methods, experimental device methods, learning media in the form of videos, e-books, handouts, web, and so on. In retrospect, both the methods, models, and learning media that will be applied can effectively prevent or overcome misconceptions. The author hopes that in the future, there will be many innovative methods, media, and learning models as one of the efforts to educate the nation's children. Abstrak Dinamika Rotasi merupakan salah satu mata pelajaran fisika yang cukup sulit bagi siswa. Beberapa penelitian sebelumnya menunjukkan kesulitan siswa pada topik ini. Sehingga hal itu menimbulkan siswa mengalami miskonsepsi. Maka dari itu, tujuan disusun nya artikel ini adalah untuk: (1) mengetahui faktor penyebab dan jenis-jenis miskonsepsi; (2) mengetahui metode, model, serta media pembelajaran fisika materi dinamika rotasi dan kesetimbangan benda tegar. Metode penelitian yang digunakan adalah berupa tinjauan literatur, dengan kata kunci mekanika benda tegar. Pada hasil terdapat beberapa jenis metode, model dan media pembelajaran, beberapa contohnya adalah model discovery learning, model problem based learning, metode pembelajaran berbasis saintifik, metode perangkat percobaan, media pembelajaran berupa video, e-book, handout, web, dan lain sebagainya. Jika ditinjau kembali, baik metode, model dan media pembelajaran yang akan diterapkan dapat efektif untuk mencegah maupun mengatasi miskonsepsi. Penulis berharap dimasa yang akan datang, banyak inovasi metode, media maupun model pembelajaran sebagai salah satu upaya untuk mencerdaskan anak bangsa.
Stock buyback is a share repurchase by the company (issuer) which is one of the ways the company does to generate profits for shareholders. Stock buyback is part of investment strategy in order to increase company value. This study tries to observe the information content of the buyback policy that uses a variable of Return (R), Abnormal Return (AR), and Cumulative Abnormal Return (CAR). This was a descriptive research with a quantitative approach. The form of this research was an event study. The research result reveals that there is a significant difference in return before and after the stock buyback. The Abnormal Return shows that there is no significant difference in Abnormal Return before and after the stock buyback. The Cumulative Abnormal Return shows that there is a significant difference of Cumulative Abnormal Return before and after the stock buyback. KEY WORDS Stock buyback, return, abnormal return, cumulative abnormal return.
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