![]() ![]() The location of an observer from where he views an object is called a frame of reference. For convenience, we can take a frame of reference as X, Y, and Z-axis which are mutually perpendicular to each other.įrom the above example if you take the earth and train as a reference then the book or person is stationary but if we take the Moon and object (which is outside the window) as a frame of reference then the book and person are moving. ![]() Definition of frame of referenceĪs aforementioned, it is clear that to locate the position of an object you need a frame of reference. Here comes the concept of the frame of reference. Therefore rest and motion both depend on the observer’s position (frame of reference). So we can so say that there is no absolute rest or absolute motion. So the table on earth changes its position and so the book also changes its position.Īnother example is that a person is traveling on the train he observes that all the objects (trees, platforms, electricity poles, etc.) outside the train are moving and that person is also moving while the observer outside the train is viewing him.īut another person who is also traveling on the same train observes that the first person is stationary unless there is some jerk experienced by a person. But when the same person views it from outside of the earth or from the moon then he observes that the whole earth is moving and it changes its position. There is no absolute rest and motionįor example, a book is placed on the table and when a person views it from earth then that person can say that the book is stationary. This is a general definition of rest and motion. An object is said to be at rest when its position does not change with time. Generally, we define an object as in motion when its position changes with time. ![]() The general definition of Rest and motion Further, kinematics is the branch of mechanics that deals with the study of the motion of any object without involving the cause of motion i.e. Mechanics is subdivided into kinematics, dynamics, and static. Mechanics is the branch of physics in which we study the relationship between force, motion, and energy. ![]() Acceleration of gravity (free-falling object).The general definition of Rest and motion.The distance traveled, however, is the total length of the path taken between the two marks. The displacement is simply the difference in the position of the two marks and is independent of the path taken when traveling between the two marks. One way to think about this is to assume you marked the start of the motion and the end of the motion. In kinematics we nearly always deal with displacement and magnitude of displacement and almost never with distance traveled. In this case her displacement would be + 2 m +2 \text 1 5 0 m 150, start text, space, m, end text. For example, the professor could pace back and forth many times, perhaps walking a distance of 150 meters during a lecture, yet still end up only two meters to the right of her starting point. By magnitude, we mean the size of the displacement without regard to its direction (i.e., just a number with a unit). People often forget that the distance traveled can be greater than the magnitude of the displacement. ![]()
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