Laboratory Stand for Simplified Verification of Missile Dynamics for Didactic Purposes

The purpose of this study was to describe dynamics of missile based on bibliography, simplify the model to the easiest form, and verify it with the use of a designed laboratory stand. Next, a simple control system of the missile was designed. The stand is prepared for didactic purposes. A mathematical model was derived by applying Newton's second law together with the earth's coordinate system and the base coordinate system. Parameters of the actual rocket model were determined using the created laboratory stand. Synthesis of the rocket roll system was designed using Simulink PID Tuner application (MathWorks, Inc. Natick, Massachusetts, USA). A control system was based on a proportional-integral (PI) regulator. The designed control system was subjected to simulated tests in MATLAB Simulink (MathWorks, Inc. Natick, Massachusetts, USA).

A Qualitative Study: Physics Concepts Used by Survivors in the 2018 Tsunami in Palu City

This study aimed to identify and examine the Physics concepts used by victims of the tsunami disaster in Palu City based on the earthquake, tsunami and liquefaction events that occurred on September 28, 2018 in Palu City. This research was descriptive qualitative. Data were collected by observation, interviews and documentation. Based on the results of the study, the researchers found several Physics concepts that were applied when the victims made efforts to save themselves from the tsunami. These findings were discussed and grouped according to the theme of the Physics concept, including: the concept of speed and velocity, Newton’s Second Law Concept, the concept of floating objects, and the concept of waves. The results can be used as a contextual example in learning physics. By doing so, the students will not only learn about Physics concepts, but also improve their understanding and awareness of local disasters.

Hilbert’s 6-th problem and principle of completeness in dynamics

The following offers a new axiomatic basis of mechanics and physics in their most important dynamics domain, i.e. a principle (axiom) of completeness intended to generalize Newton’s second law of motion for the case of a non-stationary variable-mass point (system) that varies with time. This generalization leads to hyperdynamic dependencies describing such motion from new accurate qualitative standpoints.

The Effect of Using Schoology-Assisted Inquiry-Based Student Worksheet on Student Learning Outcomes

This study aimed to determine the effect of Schoology-assisted inquiry-based student worksheets on Newton's Law II material on students’ learning outcomes. The population in the study were all students of class X IPA. There are only two classes of X IPA at SMA Yadika Bandar Lampung, so the two classes were used as controlled and experimented classes. Controlled and experimented classes were chosen randomly, so it was determined that class X IPA 1 was the controlled class and X IPA 2 was the experimented class. The research method used was a quasi-experiment with a non-equivalent control group research design. The experimented class used a Schoology-assisted inquiry-based student worksheet, while the controlled class was given conventional learning. The two classes were given a different treatment, the experimented class implemented learning using guided inquiry-based worksheets, and the controlled class used a learning model that the physics teacher had implemented in the class. Before and after learning in both classes, five questions with HOTS level were given so that pretest and posttest data would be obtained as learning outcomes data. The data were analyzed by three tests: N-Gain, Independent Sample T-Test, and Effect Size Test. Based on the results of data analysis, there was an increase in cognitive learning outcomes in the controlled class, which was 0.21 included in the low category, while learning outcomes of the experimented class increase were 0.47 included in the moderate category. Besides that, the independent sample T-Test earned a value of sig. 2-tailed of 0.000, so it can be seen that there was an effect of using guided inquiry-based worksheets assisted by Schoology on Newton's Second Law towards students’ learning outcomes. In addition, the effect size test results showed a moderate category, so it can be concluded that Schoology-assisted inquiry-based student worksheet on Newton's second law material affects student learning outcomes. Based on the effect size test, the cohend's d value was 0.98 with a large category. This proved that the use of Schoology-assisted inquiry-based student worksheets had a moderate effect on students' cognitive learning outcomes.

Modification of Newton's second law of motion

In this paper, the effect of resistances on applied force has been studied practically. As per the study, the existing Newton’s equation (F=ma) calculates only net force and does not count the effect of resistances. It has been observed that in every action some part of the applied force is required to overcome the effect of resistances (friction, air resistances, etc.); and when applied force exceeds that amount only then a stationary body accelerate. Hence a mathematical expression (F=ma+r) has been provided by including a factor describing above said resistances.