![]() ![]() To describe the position of an object undergoing one-dimensional motion, we often use the variable x. To describe the position of a person in an airplane, for example, we use the airplane, not Earth, as the reference frame. In other cases, we use reference frames that are not stationary but are in motion relative to Earth. For example, a rocket launch could be described in terms of the position of the rocket with respect to Earth as a whole, whereas a cyclist’s position could be described in terms of where she is in relation to the buildings she passes Figure 3.2. Earth is often used as a frame of reference, and we often describe the position of an object as it relates to stationary objects on Earth. ![]() A frame of reference is an arbitrary set of axes from which the position and motion of an object are described. More precisely, we need to specify its position relative to a convenient frame of reference. To describe the motion of an object, you must first be able to describe its position ( x): where it is at any particular time. When you’re in motion, the basic questions to ask are: Where are you? Where are you going? How fast are you getting there? The answers to these questions require that you specify your position, your displacement, and your average velocity-the terms we define in this section. Calculate the average velocity given the displacement and elapsed time. ![]()
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