The Student Room Group

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A student is carrying out an experiment to determine the time period of vertical oscillations of a mass attached to a spring.

The student placed a marker at the centre of the oscillation. Justify why this is the best place to use as a reference point.


MS: this is the equilibrium position , mass is moving fastest , value of T more precise, uncertainty at this point is the least.

My question is that wouldnt it be harder to measure the oscillation, since it's moving fast so there will be more uncertainty?? How is it less

Reply 1

bc if its at the bottom most point ur value of T is gonna be bigger than if the marker was elsewhere. the absolute uncertainty remains the same. ie half the smallest division, so if you’re measuring in 0.1s ur absolute uncertainty would be 0.05s now the percentage uncertainty is ur absolute unc over ur T value. imagine this as a fraction, if T is bigger and u have the same absolute uncertainty ur percentage uncertainty will be smaller. plus notmally in these cases theyre talking about percentage uncertainity

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