[我未来的生活为题的英语作文]The days of my future My future will be happy. I already graduated at that time from the university. I will have a stable work.I will have my family, my husband...+阅读
We are so used to our life on the surface of the earth that it is not easy for our minds to break free of all the ideas that we take for granted. For example, we can feel things are heavy, so we think of weight as being a fixed quality in an object. But actually, it is not fixed at all. If you could take a one-pound packet of butter four thousand miles out from the earth, it would weigh only a quarter of a pound. The reason for such a change of weight is this: all objects have a natural attraction for all other objects. This is called gravitational attraction, but this power of attraction between two objects gets weaker as they get farther apart. So the weight of an object on the surface of the earth is not the same as its weight 4000 miles out in space. What about the weight of a one-pound of butter on the surface of the moon? There won't be attraction between the butter and the moon, but the butter will weigh only about 1/6 as much as it does on the earth. This is because the moon is so much smaller than the earth. The amount of a gravitational pull that a body produces depends on the amount of material in it. A packet of butter has a gravitational pull of its own, but it is very small in relation to the pull of something as large as the moon or the earth.
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