DP Physics (last assessment 2024)

Question 18N.3.SL.TZ0.c.ii

Date	November 2018	Marks available	[Maximum mark: 2]	Reference code	18N.3.SL.TZ0.c.ii
Level	SL	Paper	3	Time zone	TZ0
Command term	Suggest	Question number	c.ii	Adapted from	N/A

c.ii.

[Maximum mark: 2]

18N.3.SL.TZ0.c.ii

In an investigation to measure the acceleration of free fall a rod is suspended horizontally by two vertical strings of equal length. The strings are a distance d apart.

When the rod is displaced by a small angle and then released, simple harmonic oscillations take place in a horizontal plane.

The theoretical prediction for the period of oscillation T is given by the following equation

$T = \frac{c}{{d\sqrt g }}$

where c is a known numerical constant.

In one experiment d was varied. The graph shows the plotted values of T against $\frac{1}{d}$ . Error bars are negligibly small.

Suggest whether the data are consistent with the theoretical prediction.

[2]

Markscheme

theory predicts proportional relation « $T \propto \frac{1}{d}$ , slope = Td = $\frac{c}{{\sqrt g }}$ = constant » ✔

the graph is «straight» line through the origin ✔

Syllabus sections

Core

Core » Topic 1: Measurements and uncertainties » 1.2 – Uncertainties and errors

Core » Topic 1: Measurements and uncertainties

Question 18N.3.SL.TZ0.c.ii

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