# Practical Skills Flashcards

Put these prefixes in order of ascending size: centi, micro, pico, nano, milli, femto.

femto, pico, nano, micro, milli, centi

Put these in ascending order and say their power: mega, giga, kilo, tera.

kilo {k} (10^3), mega {M} (10^6), giga {G} (10^9), tera {T} (10^12)

What is the independent variable?

What is changed in the course of the experiment

What is the difference between a reading and a measurement?

A reading is a value found from a single judgement e.g. looking at a thermometer or ruler, whereas a measurement is multiple readings combined - for example using a stopwatch where there is uncertainty both at the start and stopping points

How much uncertainty do you add for a reading?

+ or - 0.5 of the resolution

How much uncertainty do you add for a measurement?

As it has to comprise of more than one reading, measurements are mostly taken as at least + or - 1 of the resolution

What is the resolution of a micrometer?

+ or - 0.01 mm as shown on the barrel

What can you do to reduce uncertainty and what is the calculation to determine how much you have reduced it by?

Do many repeat measurements, and you would do uncertainty of the whole measurement/the number of instances

What are two commonly forgotten tips to use when counting oscillations of a pendulum?

Only start counting after one or two oscillations have already passed, use a fiducial marker

Which variable goes on which axis of an experimental graph?

y = dependent variable, x = independent

What does the time base mean on an oscilloscope?

The amount of time one square represents