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Edexcel A-Level Physics Slope and Intercept

Review slope and intercept in Edexcel A-Level Physics through best-fit lines, large-triangle gradients and constants read from graph intercepts.

Syllabus
Pearson Edexcel International Advanced Subsidiary/Advanced Level
Course
Physics XPH11/YPH11
Level
A2

Exam points

  • calculate a graph gradient with a large triangle and state the physical constant it represents
  • read or calculate a y-intercept, then convert a log intercept back to the original quantity
  • compare a suggested constant with the graph gradient or intercept to judge whether it is valid

C.3.4—Slope and intercept question 1

[Maximum number: 3]

A student investigated the damped oscillations of a pendulum using the apparatus shown.

The paper cone acted as a damper.
The student displaced the cone and allowed the pendulum to oscillate.
He measured the amplitude A every 5 oscillations and recorded the value to the nearest 5 mm.

Figure for Question C.3.4—Slope and intercept question 1 — Edexcel A-Level Physics A2

The relationship between A and the number of oscillations n is

A=A_0 e^- n

where A_0 is the initial amplitude and is a constant.

Determine the value of A_0 from the graph.

A_0=

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