The center of mass (CM) is an abstract quantity but essential as a reference point used to understand the position and movement of an object or a system of objects. Many researchers have used video recordings to analyze and understand the movement of objects in a system. In a system with colliding objects, the motion can be obtained precisely from video analysis. Estimating the momentum of each object can allow analysis of the conservation of linear momentum of the collision.
Student worksheets are used as a learning resource that is concise and practical. The design of student worksheets that is concise and practical tends to be low in developing the stages of thinking processes. Physics learning that studies natural behavior always involves analytical thinking. The development of student worksheets based on analytical thinking design is the important goal in this study. Three stages are used to develop student worksheets with an analytical thinking design, that are differentiating, organizing, and attributing. Student worksheets design with the development of analytical thinking has been generated for momentum material. The differentiating stage includes identifying the quantity of moving object, defining the amount of momentum and estimating the velocity before and after the collision. The organizing stage includes the activities of analyzing and relating the momentum quantity to the collision phenomenon. While the attributing stage includes the activities of deducing the relation between momentum quantity and the collision phenomenon, also evaluating the law of conservation of linear momentum of a collision. The results of student worksheets validation obtained a percentage of 92.9%, so this learning resource is in a highly valid criteria. The design of student worksheets that develop analytical thinking skills can form the basis and support higher thinking skills.
The momentum is often used to analyse the dynamics of the motion of an experimental interaction between objects. Meanwhile, the interaction force tends to be challenging to observe and obtain. In this study, a simple video-assisted experiment was used to observe the interaction forces during the interaction of two magnetic objects. The interaction force between magnetic dipoles was obtained for each object position during the interaction experiment. The maximum force interaction was obtained when the two objects were at the minimum distance. The velocity of the object significantly influences the minimum distance between two objects during the interaction. In addition, we found that the law of linear momentum conservation holds for this interaction. Furthermore, the total kinetic energy before and after the interaction is identical, indicating an elastic interaction. This study is hopefully beneficial for students to reduce the limitations in understanding the interaction forces between objects.
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