Explanation:
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Force causes an object to move in the same direction that the force is applied. Friction reduces efficiency<span> when two surfaces slide past each other, also </span>friction<span> resists their motion, and in </span>machines<span>, some input work is always used to overcome </span>friction<span>.
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We use a spectrometer to help us determine what stars and planets are made of by passing a light through various chemical elements, different spectral patterns are created. By matching those patterns up to patterns generated in a laboratory environment we can tell what the composition of a distant star or planet is.