1. The problem statement, all variables and given/known data Figure shows a particle of mass m attached with four identical springs each of length L0. Initial tension in each spring is F0.Neglect gravity calculate the period of small oscillations of the particle along a line perpendicular to the plane of figure. (Take F0 = (0.01 π2)N, m = 100 gm, L0 = 10cm) 2. Relevant equations 3. The attempt at a solution In the equilibrium state length of the spring L = L0 + z ,where L0 is the original length and z is the initial extension in the spring when in equilibrium. Initial tension in each spring when in equilibrium = kz = F0 Suppose the mass is displaced by x amount upwards .In the attachment L' represents the new length. L'=√(L2+x2) Force by a spring = k(L'-L0) = = k(L'-L+z) = k(L'-L)+kz This force will have a a horizontal component and a a vertical component .The horizontal component will be cancelled by a similar component from the opposite string . The net force from all four springs will be F = 4k(L'-L0 )sinθ = 4k(L'-L)sinθ + 4kzsinθ sinθ = x/L' So net force =4kx(L'-L)/L' + 4kxz/L’ =4kx(1-L/L') + 4kxz/L’ I somehow feel I am not approaching the problem correctly . I would be grateful if somebody could help me with the problem.