A student is investigating the bending of a loaded wooden strip. Fig. 1.1 shows a rectangular strip of width b and thickness t overhanging the edge of a bench. A length L of the strip is unsupported. [Figure 1.1] A load of mass M is positioned at point P. This causes the unsupported part of the strip to bend with a deflection s, as shown in Fig. 1.2. [Figure 1.2 (not to scale)] It is suggested that the relationship between s and L is E = (4MgL³) / (bst³) where g is the acceleration of free fall and E is the Young modulus of the wood.