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.

Q: What topic does this question test?

This question tests Deformation of solids in A-Level Physics (syllabus code 9702). It is worth 15 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Physics May/June 2019 examination, Paper 5 Variant 1 (9702_s19_qp_51.pdf).

Question

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.

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