ConceptConceptDocsDocuments

Edexcel A-Level Physics Constants from Graphs

Practise Edexcel A-Level Physics graph constants by using gradients, intercepts and equation comparisons to determine physical values.

Syllabus
Pearson Edexcel International Advanced Subsidiary/Advanced Level
Course
Physics XPH11/YPH11
Level
AS

Exam points

  • calculate gradients from large triangles and report constants with correct precision
  • use graph intercepts to determine physical quantities such as R0, W or e.m.f.
  • compare equations with y = mx + c to identify constants from gradient or intercept

3.5.5 - Relationship or constant from a graph question 1

[Maximum number: 4]

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 3.5.5 - Relationship or constant from a graph question 1 — Edexcel A-Level Physics AS

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

Figure for Question 3.5.5 - Relationship or constant from a graph question 1 — Edexcel A-Level Physics AS

The beam bent downwards as shown.

Figure for Question 3.5.5 - Relationship or constant from a graph question 1 — Edexcel A-Level Physics AS

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 3.5.5 - Relationship or constant from a graph question 1 — Edexcel A-Level Physics AS

Question (a)

(a)

Determine the gradient of your graph.

Gradient =

[ 2 ]

Question (b)

(b)

The student recorded the following measurements for the plastic beam.

l / cm = 30
w / mm = 20
h / mm = 10

Determine E, in GPa, for the plastic beam.

E = GPa

Figure for Question (b) — Edexcel A-Level Physics AS
[ 2 ]
All question bank results loaded