Available at Ward's Natural Science: http://wardsci.com/product.asp_Q_pn_E_IG0052531
Working with a model of a ladder, students determine the coefficient of friction necessary to keep the ladder in static equilibrium. Various hooks allow a mass to be placed at different positions, so the center of mass of the system can be varied. A hinged block on the bottom of the ladder ensures the contact surface is always maintained.
Ideal for for AP, B and C, IB, and advanced honors physics courses.
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