Module 2 Chapter 1 Physical Quantities, Units and Measurements Flashcards

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1
Q

Unit for Acceleration

A

m s-2

metres per second squared

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2
Q

Unit for Density

A

kg m-3

kilograms per cubic metre

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3
Q

Unit for Electrical Charge

A

C

coulomb

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4
Q

Unit for Energy

A

J

joule

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5
Q

Unit for Force

A

N

newton

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6
Q

Unit for Momentum

A

kg m s-1

kilogram metres per second

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7
Q

Unit for Potential Difference

A

V

volt

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8
Q

Unit for Power

A

W

watt

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9
Q

Unit for Pressure

A

Pa

pascal

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10
Q

Unit for Velocity

A

m s-1

metres per second

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11
Q

Prefix: pico

A

p

10^-12

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12
Q

Prefix: nano

A

n

10^-9

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13
Q

Prefix: micro

A

µ

10^-6

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14
Q

Prefix: milli

A

m

10^-3

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15
Q

Prefix: centi

A

c

10^-2

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16
Q

Prefix: kilo

A

k

10^3

17
Q

Prefix: mega

A

M

10^6

18
Q

Prefix: giga

A

G

10^9

19
Q

Prefix: tera

A

T

10^12

20
Q

SI Unit for Mass

A

kg

Kilogram

21
Q

SI Unit for Length

A

m

Metre

22
Q

SI Unit for Time

A

s

Second

23
Q

SI Unit for Temperature

A

K

Kelvin

24
Q

SI Unit for Electrical Current

A

A

Ampere

25
Q

SI Unit for Amount of Substance

A

mol

Mole

26
Q

SI Unit for Luminous Intensity

A

cd

Candela

27
Q

Examples of Random Errors

A
  • Variable heating in circuits causing variations in the current being measured
  • An unexpected large extension of a metal wire due to a fault in its structure
28
Q

Examples of Systematic Errors

A
  • Using a ruler with a fault in the measurements printed on it
  • A parallax error caused by reading a scale at the wrong angle
29
Q

What do random errors reduce?

A

Precision

30
Q

What do systematic errors reduce?

A

Accuracy

31
Q

Percentage Uncertainty

A

(uncertainty/measured value) * 100

32
Q

How can one measure uncertainty?

A

By using one of two methods:

  • Calculating a % difference between your ‘best’ and ‘worst’ lines of best fit
  • Combining your uncertainties for each of your measurements (either summing or multiplying them depending on how you use the values)
33
Q

For y = ab, how would you find the uncertainty of y, given the uncertainties of a and b?

A

% uncertainty in y = % uncertainty in a + % uncertainty in b

34
Q

For y = a/b, how would you find the uncertainty of y, given the uncertainties of a and b?

A

% uncertainty in y = % uncertainty in a + % uncertainty in b

35
Q

For y = a^n, how would you find the uncertainty of y, given the uncertainty of a?

A

% uncertainty in y = (% uncertainty in a) * n

36
Q

For y = a ± b, how would you find the uncertainty of y, given the uncertainties of a and b?

A

absolute uncertainty of y = absolute uncertainty of a + absolute uncertainty of b