Q1: What is the two arm lever apparatus used for in engineering education?
The FX-515 is used to study the conditions for rotational equilibrium on a centrally pivoted beam. Students apply known loads at different positions along both arms of the lever and determine the combinations of force and lever arm length that produce moment balance. The apparatus directly verifies the law of moments — that the sum of clockwise moments equals the sum of anticlockwise moments about the pivot at equilibrium.
Q2: What is the law of moments, and how does the FX-515 verify it?
The law of moments states that a body in rotational equilibrium has equal total clockwise and anticlockwise moments about any pivot point. The FX-515 verifies this by allowing students to place known weights at measured distances from the central pivot on both arms of the beam, calculate the moment contributed by each load, and confirm that equilibrium is achieved when the sum of moments on both sides balances. The ball bearing pivot ensures the beam responds sensitively to any moment imbalance.
Q3: Why is a ball bearing used at the pivot of the FX-515?
A ball bearing pivot minimises rotational friction at the central mount, ensuring that the beam responds to even small moment imbalances with a visible deflection. Without low-friction bearings, friction at the pivot would mask small differences between the moments on each arm, reducing the sensitivity and accuracy of the equilibrium experiments. The ball bearing mounting allows the FX-515 to be used for precise quantitative experiments rather than only qualitative demonstrations.
Q4: How many load positions can be used simultaneously on the FX-515?
The FX-515 is supplied with three riders, each fitted with a hook, which can be positioned independently at any point along the beam scale on either arm. This allows up to three simultaneous load positions to be set at any time, enabling experiments with multiple forces on a single arm, forces distributed across both arms, or progressive experiments that add one load at a time while adjusting others to maintain or restore equilibrium.
Q5: What is included in the scope of delivery for the FX-515?
The FX-515 is supplied as a complete experimental kit including: one two-arm lever experimental unit with 600 mm ball bearing-mounted beam and sturdy metal frame; three riders with hooks; three sets of weights (3 x 0.5 N hangers, 6 x 5 N, 12 x 1 N, 6 x 2 N); and one instructional manual covering experimental procedures, moment calculations, and data recording guidance.