Force gauge with adjustable air damper to determine friction forces; slip/stick effect Features - fundamentals of mechanical friction - stationary friction body, uniformly moving friction plate - force gauge with air damping cylinder Learning objectives/experiments - difference between static and dynamic friction - friction forces as a function of -- normal force -- sliding velocity (relative velocities of the friction partners) -- material pairing -- surface properties of the friction partners -- size of contact area - slip/stick effect - determination of friction coefficients Specification [1] mechanical friction between 2 solid bodies [2] friction body stationary, friction plate in a moving carriage [3] 2 friction bodies each with 2 different surfaces [4] 3 friction plates with a total of 4 different surfaces [5] carriage driven by cable pulley and motor [6] 2 driving velocities via a graduated cable drum [7] force measuring unit: force gauge and adjustable air damper [8] force measuring unit height-adjustable [9] lines of action of friction force and tensile force always parallel [10] adjustable air damper - with damping: measurement of a mean friction force adjusted by disturbances, without damping: slip/stick effects measurable [11] storage system to house all parts Technical data Friction plate - LxWxH: approx. 175x80x6mm - aluminium - PVC / felt - glass Friction body - LxW: approx. 50x40mm - dead-weight force: approx. 1N - smooth / rough (Al), h=20mm - brass / felt, h=5mm Drive - synchronous motor - speed: 100min-1 - driving velocities: 23,5cm/min, 47cm/min Weights: 8x 0,5N Measuring ranges - force: 0...2N, graduation: 0,05N 230V, 50Hz, 1 phase 230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase UL/CSA optional LxWxH: 720x480x178mm (storage system) Weight: approx. 10kg (storage system) Weight: approx. 7kg (experimental unit)
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