TAILIEUCHUNG - English for students of Physics_Unit 6

Besides the blowing dust and the heavenly bodies, little else moves on the Martian landscape. This lack of movement might seem to be strangest of all, for we humans are used to motion. Almost from birth, infants follow motion with their eyes, and from then on we are continually aware of things moving about, starting, stopping, turning, bouncing. On earth we see liquids flowing, people moving, and the wind stirring the leaves of trees. Although we can not see them, we know that the very atoms and molecules of matter are continuously in motion. Even mosses and lichens that. | 5 Unit Six MOTION READING PASSAGE Motion speed and velocity Besides the blowing dust and the heavenly bodies little else moves on the Martian landscape. This lack of movement might seem to be strangest of all for we humans are used to motion. Almost from birth infants follow motion with their eyes and from then on we are continually aware of things moving about starting stopping turning bouncing. On earth we see liquids flowing people moving and the wind stirring the leaves of trees. Although we can not see them we know that the very atoms and molecules of matter are continuously in motion. Even mosses and lichens that spend their lives fastened to rocks depend on the movements of gases and liquids to bring them the chemicals essential to life and to carry others away. We take part in motion in our daily lives. We describe and compare this motion in terms of speed acceleration and direction. The following will discuss the first two matters. If we just say something moves someone else will not really know what s happening . It is one thing to recognize motion but another to describe it. To describe motion accurately we use rates. A rate tells how fast something happens or how much something changes in a certain amount of time. An example of rate is a distance divided by a time. Suppose a girl runs a course that is 3 miles long. She might sprint at the beginning but tire and slow down along the way or even stop to tighten a shoelace so she won t travel at the same rate for the entire 3 miles. But if she finishes in say 30 minutes then 3 miles 30 minutes miles minute is the average rate of travel during that time or her average speed average speed total distance covered time used . The average speed tells little of what happened during her run however. If we are curious about her speed at one certain time or at a point along the way we want to know her instantaneous speed that is how fast she was moving at one instant instantaneous speed the rate at which .

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