Trying to find please equation(s) to calculate the "elasticity", "stiffness" of a homotropic cantilever diving board. Am seeking some analogue of the spring constant of Hooke's law, F= -kx, for this 3-D system. I'm unclear about whether Young's modulus applies here given the force ( or pressure ) of the diver being normal to the long axis of the board. Am seeking a treatment insofar as possible at a level of advanced high school physics, ie for the "ideal" board with assumptions of homotropic material, isothermal, elastic limit not exceeded etc / forego differential equations please. Although it be a topic for another day, I am looking at the diving board as a model for my ultimate goal to measure the elasticity of a woodwind reed as a function of age ( use ). Thanks in advance.