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Accurate Clock Pendulums$
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Robert J. Matthys

Print publication date: 2004

Print ISBN-13: 9780198529712

Published to Oxford Scholarship Online: January 2010

DOI: 10.1093/acprof:oso/9780198529712.001.0001

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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 07 March 2021

Does a pendulum’s axis of rotation shift with amplitude?

Does a pendulum’s axis of rotation shift with amplitude?

(p.21) Chapter 5 Does a pendulum’s axis of rotation shift with amplitude?
Accurate Clock Pendulums

Robert James Matthys

Oxford University Press

This chapter describes an experiment to determine whether a pendulum's axis of rotation moves when the swing amplitude is increased. This issue presupposes that the pendulum has a flat spring type of suspension. A flat suspension spring bends all along a section of its length, so there is no obvious reason to indicate that a pendulum's axis of rotation would remain fixed when the swing amplitude is increased. The axis of rotation is found by measuring the horizontal travel of two points on the pendulum rod, one point a little above the axis of rotation and the other a little below it. The axis of rotation does move downward slightly (down the suspension spring), as the pendulum's swing amplitude increases. This should make the pendulum speed up as the amplitude increases, but in reality a pendulum actually slows down with increasing amplitude.

Keywords:   axis of rotation, pendulum, swing amplitude, suspension spring

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