Q1: What is the friction on inclined plane apparatus used for?
The FX-509 is used to determine the coefficients of static and dynamic friction for different material pairings on an inclined surface. Students use two methods — the angle-of-sliding method and the tensile force method — to measure the friction force at the point of impending or uniform motion, and calculate friction coefficients from the recorded data. The unit also supports experiments on static equilibrium and the critical angle of inclination for sliding.
Q2: What are the two experimental methods supported by the FX-509?
In the first method, the inclined plane is tilted gradually until the sample block begins to slide under gravity alone. The angle at which sliding begins is used to calculate the coefficient of static friction. In the second method, the plane is held at a fixed angle and a hanging weight applies a tensile force to the block via a cord and pulley. Weights are added until the block slides upward at uniform velocity, giving the coefficient of dynamic friction.
Q3: What material pairings are provided with the FX-509?
The FX-509 includes four sample blocks representing two material pairings: one steel block and one polypropylene block, and one aluminium block and one brass block. Each block measures 80 x 60 x 22 mm and is placed with its defined material face in contact with the plane surface. This allows students to compare friction coefficients across four distinct material combinations against the plane surface.
Q4: Why is a ball bearing-mounted deflection roller used instead of a simple pulley?
A ball bearing-mounted roller significantly reduces friction at the deflection point, ensuring that the force applied by the hanging weights is transmitted to the sample block with minimal loss. This keeps the experimental error low and ensures that the measured hanging weight at the point of sliding accurately reflects the friction force acting on the block, rather than including pulley friction as an uncontrolled variable.
Q5: What is included in the scope of delivery for the FX-509? The FX-509 is supplied as a complete experimental kit including: one inclined plane experimental unit with MS base, drag link, angle scale, and ball bearing deflection roller; four material sample blocks (steel, polypropylene, aluminium, brass); one graduated weight set (1 x 0.5 N hanger, 3 x 5 N, 2 x 2 N, 2 x 1 N, 2 x 0.5 N, 5 x 0.1 N); one thread; and one instructional manual covering both experimental methods, data recording procedures, and sample calculations.
