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Working Model On Friction . The friction loss in feet of head per 100 feet of steel pipes schedule 40, copper pipes type l and thermoplastic pvc pipes schedule 40 are compared below. (e) sliding friction is _____ than the static friction. DrillWell results presented and discussed at mini seminar from drillwell.no (b) friction depends on the nature of surfaces. Nonconservative forces other than friction include other contact forces, tension, compression, and drag. (d) sprinkling of powder on the carrom board reduces friction.