The downward deflection y (m) of a cantilever beam with a uniform load w (kg/m), as depicted in the figure below, can be computed as:
dy/dx = w / (24EI) * (4x^3 - 12Lx^2 + 12L^2x)
where:
x = distance (m)
E = the modulus of elasticity (2x10^11 Pa)
I = moment of inertia (3.25x10^-4 m^4)
w = 10,000 N/m
L = length (4 m)
y = 0 at x = 0
Use the first-order forward difference approximation of dy/dx to compute the deflection at the tip of the beam, i.e. x = 4 m, with a step size of delta_x = 1 m.