For determining the mechanical advantage and demonstrating the principle of conservation of energy.
Consists of the four-step wooden wheel of 35, 50, 65 and 105mm diameters fitted with ball bearings, turning on a single, plated steel rod which can be clamped to a support stand using a right angle clamp. Each wheel has a flat groove to accept several turns of a cord with a small hole at each groove for holding a knotted cord. Can be fitted to a support stand with a right-angle clamp (not included). Recommended for use with nylon twine.