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Abstract
The development of Science has an impact on rapid technological advances, including transportation. One alternative that is often used and becomes public transportation is the train. This study aims to increase students' insight into the mechanisms that occur on trains, especially when the train is moving and braking will cause a comparison of speed to distance and the frictional force that occurs as a result of the wheels and rails touching. The direct method by observing and taking data directly is the method used in this study. What is observed is the initial and final speed that occurs when the train is braking or moving compared to the required travel time. In addition, when calculating the friction force, what is needed is the mass of the train with the coefficient of friction. In the study, the acceleration and braking distance of the train movement was obtained. The formula accepts the distance for uniformly changing straight motion, which means that the braking distance is about 300 m to 400 m so that it stops right at the station. Meanwhile, the distance travelled by train is about 250 m to 350 m from the departure at the station. Other things obtained are the magnitude of the static frictional force of approximately 3456000 N and the kinetic friction of about 422400 N. The distance travelled by train to stop precisely from one station to another is called the braking distance. The distance travelled by train to move at a constant speed after stopping is the definition of the movement distance. In addition, the train also has a regular average rate of around 70 to 75 km/hour. It is very closely related when the acceleration that occurs on the train is getting bigger, it will affect the braking distance, and the movement is gaining closer. However, it was also found that if the frictional force between the wheels and the rail bearings is considerable, it can stop the train right at the station.