units and uncertainty Flashcards

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1
Q

list the 7 base units

A

mass - kilogram
length - metre
time - second
temperature - kelvin
current - amp
light intensity - candela
amount of substance - mole

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2
Q

express the base units of magnetic flux density

A

F = BIL
B = F/(IL)
= N/Am
= (kgms^-2)/Am
= kg(A^-1)(s^-2)

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3
Q

express the base units of spring constant

A

F = kx
k = F/x
= N/m
= (kgms^-2)/m
= kgs^-2

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4
Q

define systematic errors

A

a predictable error that can be measured and removed from measurements

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5
Q

Define random error

A

an error that cannot be predicted and can only have its effects reduced by measuring repeat readings and calculating an average

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6
Q

define precision

A

the number of decimal places to which a measurement is stated

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7
Q

define resolution

A

the smallest division on a measuring instrument

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8
Q

define sensitivity

A

the smallest detectable change in conditions using an instrument

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9
Q

Define accuracy

A

how close a measurement is to the true value

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10
Q

uncertainty in a measurements from an analogue measuring device

A

half of the resolution of the measuring device

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11
Q

uncertainty in a measurement from a digital measuring device

A

resolution of the measuring device

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12
Q

uncertainty in an average value is calculated using

A

(range of repeated reading) / 2

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13
Q

uncertainty in a gradient is calculated by

A

drawing a line of best fit and worst fit.
Find the difference between the gradients of the 2 lines

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14
Q

uncertainty in a y-intercept/x-intercept is calculated by

A

drawing a line of best fit and worst fit.
Find the difference between the y-intercepts/x-intercepts of the 2 lines

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15
Q

scalar

A

property that has only magnitude

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16
Q

vector

A

a property that has both magnitude and direction