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We present here physics lessons on the application of the simple oscillation concept through measuring the rate of human respiration during various activities. The measurement used a smartphone’s magnetometer sensor, which recorded changes in the magnetic field of a permanent magnet that was attached to the stomach while breathing. Measurements were taken during rest, after walking for 10 min, and after running for 10 min. The experimental results showed that the magnetic field changed periodically with respiration, which indicated an oscillation. From the recorded magnetic field data, the oscillation period and respiratory rate per minute were calculated. From this experiment, physics students can learn that human breathing is an application of the concept of oscillation because it is periodic. This method is also an alternative to the conventional method using a stopwatch. Students also learn how activity affects the rate of breathing.

This article aims to analyze the effectiveness of using the Khan Academy platform as a support for science learning during the Covid-19 Pandemic to improve students' mastery of online learning skills. Online learning is one of the impacts caused by the spread of Covid-19 in the field of education. This condition causes teachers to use digital technology such as platforms to support the learning process. The integration of Khan Academy in science learning is a breakthrough in delivering learning materials that are in accordance with the applicable curriculum with consideration of material from teachers that is applied online. In this case, the teacher can designate the material according to the mastery of the skills students have. Then students can carry out activities to analyze video tutorials, work on practice questions to do practicum according to the instructions in Khan Academy. Teachers and parents can also monitor and supervise the activities, abilities and mastery of students' material. Based on the literature review, Khan Academy helps in classroom management, practicum activities through video tutorials, and practice questions and activity monitoring as an effective student progress report.