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Edexcel A-Level Physics A2 Substitution into Equations

Edexcel A-Level Physics A2 Substitution into Equations
Pearson Edexcel International Advanced Subsidiary/Advanced Level in Physics, Issue 3, July 2021Physics XPH11/YPH11

Review substitution into equations in Edexcel A-Level Physics through modulus, strain and luminosity calculations using measured quantities.

How this is tested

  • substitute measured values with converted SI units into equations for modulus, strain or luminosity
  • evaluate squared and fourth-power terms accurately before giving a rounded physical value

Question 4(c)(iii)

[Maximum number: 2]

A student investigated the bending of a plastic beam.

The beam, of width w and height h, was supported at either end by two metal rods a distance l apart, as shown.

Figure for Question 4(c)(iii) — Edexcel A-Level Physics A2

She applied a force F to the middle of the plastic beam by hanging a mass from it.

Figure for Question 4(c)(iii) — Edexcel A-Level Physics A2

The beam bent downwards as shown.

Figure for Question 4(c)(iii) — Edexcel A-Level Physics A2

She measured the vertical distance d moved by the middle of the plastic beam and repeated this measurement for increasing values of F.

She recorded her results in a table, as shown.

Table for Question 4(c)(iii) — Edexcel A-Level Physics A2

The student recorded the following measurements for the plastic beam.

Table for Question 4(c)(iii) — Edexcel A-Level Physics A2

Determine E, in GPa, for the plastic beam.
(2)
E= GPa