It takes a force of 80 N to start it moving. What is the coefficient of static friction between the sofa and the carpet?
2 forces are acting on the sofa. Force moving the Sofa forward = P = 80 N Frictional force = f Mass of the Sofa = M = 145 kg Weight of the Sofa = W = M g = 145*(9.8) N μ = Coefficient of static friction f = μ W = μ*(145 * 9.8) N When the Sofa just starts moving P and f balance each other i.e. P = μW μ*(145 * 9.8) = 80 = μ = 80 / (145 * 9.8) = 0.0563
