Page 18 - WAVES

Experiment in Barton’s pendulum

What happens when pendulum X is made to oscillate?

• When pendulum X is swung into oscillation, all the other

pendulums swing.
• Pendulum D swings with maximum amplitude.
• This is because, the length of the pendulum X = length of

the pendulum D.
• The frequency of oscillation of the pendulum X =

frequency of oscillation of the pendulum D.
• Resonance has occurred in pendulum D and caused it to
swing with maximum amplitude.

Exercise 6.1.2

1. The figure shows a simple pendulum with a mass of
40.0 g and a length, L of 20.0 cm. The pendulum

makes 20 complete oscillations in 18.80 seconds.
Relationship between period of oscillation, T of the
simple pendulum with its length, L is expressed in the

formula below as :

C A Highest L where g is gravitational
Lowest B Position T= π2
Position g acceleration.

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