ocr: What is friction? Even the smoothest surfaces, such as mirrors, look uneven when they're seen under a microscope. Most surfaces appear like tiny mountain ranges, with some peaks sticking up further than others. . a - - - Close-up ofmetal sterfaces When tWo objects, like a book and a table, seem to touch, they're actually only in contact at the points where these highest peaks meet. Itis this roughness that causes triction. When you push an object along a surtace, you feel triction because the links between peaks are continually breaking and re-forming. Amoving object encounters tWo types of fr ...
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