Module 2 all Flashcards

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1
Q

Scalar

A

A quantity that has only magnitude (size) and no direction.

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2
Q

Vector

A

A quantity that has both magnitude and direction.

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3
Q

Accuracy

A

A measure of how close a measurement is to the true value

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4
Q

Control Variables

A

Variables that must remain the same throughout an
experiment so as to not affect the results

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5
Q

Dependent Variables

A

The variable being measured in an experiment. It is
dependent on the independent variable. The dependent variable should be plotted
on the y-axis of a graph.

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6
Q

Independent Variables

A

The variable that is changed by the experimenter in an
experiment. The independent variable should be plotted on the x-axis of a graph

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7
Q

Precision

A

A measure of how close a measurement is to the mean value. It only
gives an indication of the magnitude of random errors, not how close data is to the
true value.

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8
Q

Random Errors

A

Unpredictable variation between measurements that leads to a
spread of values about the true value. Random error can be reduced by taking
repeat measurements

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9
Q

Repeatable

A

The same experimenter can repeat a measurement using the same
method and equipment and obtain the same value

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10
Q

Reproducible

A

An experiment can be repeated by a different experimenter using
a different method and different apparatus, and still obtain the same results.

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11
Q

Resolution

A

The smallest change in a quantity that causes a visible change in the
reading that a measuring instrument records

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12
Q

SI Units

A

The standard units used in equations. They are: metres, kilograms,
seconds, amps, Kelvin and moles.

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13
Q

Systematic Errors

A

Causes all readings to differ from the true value by a fixed
amount. Systematic error cannot be corrected by repeat readings, instead a
different technique or apparatus should be used.

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14
Q

Zero Errors

A

A form of systematic error, caused when a measuring instrument
doesn’t read zero at a value of zero. This results in all measurements being offset
by a fixed amount

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