2.1.1 Physical Quantities and Units Flashcards

1
Q

What is a quantity?

A

A physical quantity has a numerical value and a unit to indicate a measurement of something.

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2
Q

What are prefixes used to indicate?

A

Decimal submultiples or units.

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3
Q

What is kgms-1?

A

Momentum, because it is mass x velocity. You can tell the equations of things based off of their SI base unit composition.

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4
Q

How did the international scientific community agree on SI base units?

A

They agreed to adopt a single unit for each quantity.

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5
Q

Give the SI unit and symbol for mass.

A

Kilogram, Kg

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6
Q

Give the SI unit and symbol for length.

A

Metre, m

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7
Q

Give the SI unit and symbol for time.

A

Second, s

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8
Q

Give the SI unit and symbol for temperature.

A

Kelvin, big K

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9
Q

Give the SI unit and symbol for electrical current.

A

Ampere, big A

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10
Q

Give the SI unit and symbol for amount of substance.

A

Mole, mol

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11
Q

Give the SI unit and symbol for luminous intensity.

A

Candela, cd

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12
Q

Give the SI unit and symbol for acceleration.

A

Metres per second squared, ms^-2

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13
Q

Give the SI unit and symbol for density.

A

Kilograms per cubic metre, kgm^-3

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14
Q

Give the SI unit and symbol for electric charge.

A

Coulomb, big C

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15
Q

Give the SI unit and symbol for energy.

A

Joule, big J

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16
Q

Give the SI unit and symbol for force.

A

Newton, big N

17
Q

Give the SI unit and symbol for momentum.

A

Kilogram metres per second, Kgms^-1

18
Q

Give the SI unit and symbol for potential difference.

A

Volt, big V

19
Q

Give the SI unit and symbol for power.

A

Watt, big W

20
Q

Give the SI unit and symbol for pressure.

A

Pascal, Pa

21
Q

Give the SI unit and symbol for velocity.

A

Metres per second, ms^-1

22
Q

Abbreviation and standard form for the prefix: pico-

23
Q

Abbreviation and standard form for the prefix: nano-

24
Q

Abbreviation and standard form for the prefix: micro-

25
Abbreviation and standard form for the prefix: milli-
m, 10^-3
26
Abbreviation and standard form for the prefix: centi-
c, 10^-2
27
Abbreviation and standard form for the prefix: deci-
d, 10^-1
28
Abbreviation and standard form for the prefix: kilo-
k, 10^3
29
Abbreviation and standard form for the prefix: mega-
Big M, 10^6
30
Abbreviation and standard form for the prefix: giga-
Big G, 10^9
31
Abbreviation and standard form for the prefix: tera-
Big T, 10^12
32
How do you check the homogeneity of an equation?
Check that the base units on each side of the equation are equal.
33
What is crucial about homogeneity?
Having a homogeneous equation does not mean that it is correct, as the numbers could be wrong.