How can it be so hard to drag rubber across smooth glass if friction is caused by surface roughness ?
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Because friction is mainly caused by electrical attraction and not surface roughness, smooth objects can still have relatively high friction coefficients. ... Rubber wiper blades moving across a dry windshield experience high friction.
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Black holes are points in space that are so dense they create deep gravity sinks. Beyond a certain region, not even light can escape the powerful tug of a black hole's gravity. ... Such a burst flings star matter out into space but leaves behind the stellar core.
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