is it easier to roll a barrel or to pull it on a horizontal road? explain
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It is easier, because the friction forces absorb kinetic energy. The magnitude of this force is proportional to kinetic energy. ... Rolling friction does not increase with velocity, and rolling the barrel does not increase the friction between it and the road.
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This phenomenon can be explained by the concept of friction. Friction is a contact force that stops moving things or prevents stationary things from moving. ... It is easier to roll a barrel than to pull it on the road because while pulling the barrel because rolling friction is less than sliding friction...
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