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Edexcel A-Level Physics A2 Estimating Results

Edexcel A-Level Physics A2 Estimating Results
Pearson Edexcel International Advanced Subsidiary/Advanced Level in Physics, Issue 3, July 2021Physics XPH11/YPH11

Review estimating results in Edexcel A-Level Physics through parameter changes, measurement improvements and qualitative energy-output judgements.

How this is tested

  • justify how changing an experimental parameter can improve a measurable value or result
  • estimate qualitative effects such as solar-panel tracking increasing daily energy output

Question 4(d)

[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(d) — 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(d) — Edexcel A-Level Physics A2

The beam bent downwards as shown.

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

The student's teacher suggested that using a plastic beam with a smaller value of h would improve the measurement of d.

Justify the teacher's statement.
(2)