Question

What for a pendulum is used?

Answer 1

hlo mate. .

this is your question.
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what for pendulum is used?

this is your answer.
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pendulum are clocks that were used earlier for watching time. as in early days there were no watch or clocks that we use these days.

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Answer 2

A pendulum is a weight suspended from a pivot so that it can swing freely. ...Pendulums are also used in scientific instruments such as accelerometers and seismometers. Historically they were used as gravimeters to measure the acceleration of gravity in geophysical surveys, and even as a standard of length.