Straight-line motion will be described using simple equations and graphs. Later, the chapter will also discuss circular motion.
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Objects may move in a straight line, take a circular path, rotate, vibrate, or exhibit a combination of these motions.
These different perceptions indicate that motion is relative and depends on the observer’s frame of reference.
Passengers inside the bus see their fellow passengers as being at rest because they are all moving at the same velocity as the bus.
The sun appearing red at sunset is not a result of atmospheric refraction. This phenomenon is caused by scattering. As sunlight passes through more of the Earth’s atmosphere at sunset, shorter wavelengths scatter out, leaving the longer red wavelengths to ...