tension, discord, rift, antagonism, animosity, dissension, spats, acrimony, disharmony, strife, disagreements, rancor, quarrels, hostility, consternation, irritation, resentment, schism, frostiness, instability, misunderstandings, mistrust, angst, unhappiness, awkwardness, polarization, distrust, tiff, confusion, disquiet, disunity, estrangement, fissures, disputes, frictional, unease, misalignment, enmity, ructions, conflicts, dissonance, discomfort, confrontations, stiction, bickering, disaffection, uneasiness, feuding, discontent, unpleasantness, brittleness, anxiety, flap, irritant, turbulence, infighting, controversy, squabbles, overinflation, cogging, furor, uproar, splits, backlash, ruckus, dustup, imbalance, looseness, pressure, interaction, contentiousness, contretemps, nervousness, bedevilment, grumbling, slippage, antipathy, chafing, bitterness, lubrication, dissatisfaction, entanglement, jealousies, stress, chumminess, disgruntlement, tenseness, uncertainty, gravitational interaction, unbalance, differences, touchiness, delamination, wrangles, closeness, incompatibility, inertia, miscommunication, fraying, asperities, kerfuffle, anger, frictions, rubbing, frustration, aggravation, annoyance, dissipation, provocation, abrasion, suction, attrition, distraction, embarrassment, evaporation, frustrations, hydrostatic, hysteretic, viscous, absorption, damping, dissipative, expansion, diffusive, hardening, dielectric, dispersion, force, hydrodynamic, impedance, loss, ohmic, resistive, aerodynamic

adhesive friction, detrition, grinding, grip, traction

., abrasion, adhesive friction, attrited, attrition, babbitt, babbitt metal, benjamin thompson, brake pads, burned-out, burnt-out, bushing, callosity, callus, chafe, chafing, chafing gear, cone clutch, cone friction clutch, corrasion, count rumford, cylindrical lining, decrepit, detrition, disc brake, disk brake, disk clutch, drum brake, drum brakes, erosive, fray, fret, frictional, frictionless, friction clutch, friction match, fusee, fuzee, greased, grinding, grip, kitchen match, lubricant, lubricated, lubricating substance, lubricator, lucifer, maglev, magnetic levitation, magnetic needle, match, meteor, perpetual motion, rope burn, rub, scratch, shooting star, slip clutch, slip friction clutch, spark, static electricity, surface noise, thompson, traction, tribology, unburnished, wear away, wear off, windage

conflict, effort, elbow grease, exertion, resistance, sweat, travail

clash