Now that I have completed the chapter of motion, I have a much better understanding of it. Objects are in motion when its distance from a reference point is changing. Before learning this unit, I always though that things are in motion when they are moving, but now I have learned a more precise definition that properly explains it. Motion is measured by an International System of Units (SI) that is used by scientists globally. These units are used to determine if an object is in motion, by measuring the distance from the object to a reference point. A reference point is a place or object used for comparison to determine of an object is in motion. The speed of an object can be calculated by measuring the distance traveled by the object divided by the time taken. Speed in a given direction, is velocity. Velocity can be useful because it tells the specific direction that an object is heading to. A form of motion is acceleration. Acceleration can occur in 3 ways: increase in speed, decrease in speed, or change in direction. Acceleration can be calculated by subtracting the initial velocity from an object from the final velocity and dividing that by the time taken. General motion can be graphed in a distance-versus-time graph, and acceleration can be graphed in a speed-versus-time graph. One cool fact I learned is that Earth's landmasses are constantly in motion. The Theory of Tectonic Plates explains this. Over millions of years, Earth's continents have moved to form what we know as the world today. I feel that I have certainly obtained a lot of knowledge from this chapter, and this has provided clarity in my understanding of basic physics.
- Dylan Dev
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