In the master's thesis, we will explore the tasks from the 35th, 38th, and 39th national competition of primary school students in the knowledge of physics for the golden Stefan award. The tasks were solved by 8th grade pupils at the national competition in spring 2015, 2018, and 2019. We will deal with three structures open tasks. Here, pupils do not have the answers given, from which they can choose the correct one, but the task is open-ended and structured. The three tasks we will analyze and compare are divided into six or seven parts. They all relate to understanding the center of gravity and balance of forces, which is both the regular content of the physics curriculum and torque, which is neither the regular nor the optional explicit content of the 8th grade physics curriculum. Namely, the torque is introduced separately only in the introductory part of the mentioned tasks. We will check to see if there is a misunderstanding, a chain of errors and if the errors recur over the years. We will determine the success of solving tasks. The analysis of the thesis, results, and evaluation of the thesis from the 35th national competition will be used from the diploma thesis. Tasks from the 38th and 39th national competitions will be evaluated once again and the results of our assessment will be compared with the results of the official assessment.
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