Type of friction between floor and rollars of a suitcase as it pulled on the floor
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Friction is a force that opposes motion between any surfaces that are ... That's why we put sand on icy sidewalks and roads. ... The wadded piece will fall to the ground immediately.
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Friction tends to oppose any relative motion between objects, acting at the surfaces in contact. ... If there is no relative motion, the frictional force is the static force of friction. Let's say you're standing still and you then start to walk forward across a flat floor.
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