Image »Lever Rule Applied to a Machine with Wheel and Axle« download
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Lever rule \( F_1 \, r_1 = F_2 \, r_2 \) applied to a machine with wheel and axle. Here \(r_1\) and \(r_2\) are the radii of two different wheels and \(F_1\) and \(F_2\) are the forces acting on the wheels perpendicular to the radius. The lever rule is the consequence of the conservation of angular momentum \( L_1 = L_2 \).
