A lever made of wood or a light metal alloy, not less than 500 mm long with an axis for hanging from a tripod and having balancers at both ends. Holes are placed along the entire length of the lever at equal distances from the center to the ends. A scale "&"is applied with an index of 0 in the center. To demonstrate the principle of the action of weights, the conditions for the equilibrium of the lever, the addition of parallel forces, checking the rule of moments of forces. Equilibrium of forces on a lever."&" Equality of work on a lever. Determination of the conditions for the equilibrium of bodies under the action of several forces, etc.
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