2.1.1 Physical Quantities and Units Flashcards
What is a quantity?
A physical quantity has a numerical value and a unit to indicate a measurement of something.
What are prefixes used to indicate?
Decimal submultiples or units.
What is kgms-1?
Momentum, because it is mass x velocity. You can tell the equations of things based off of their SI base unit composition.
How did the international scientific community agree on SI base units?
They agreed to adopt a single unit for each quantity.
Give the SI unit and symbol for mass.
Kilogram, Kg
Give the SI unit and symbol for length.
Metre, m
Give the SI unit and symbol for time.
Second, s
Give the SI unit and symbol for temperature.
Kelvin, big K
Give the SI unit and symbol for electrical current.
Ampere, big A
Give the SI unit and symbol for amount of substance.
Mole, mol
Give the SI unit and symbol for luminous intensity.
Candela, cd
Give the SI unit and symbol for acceleration.
Metres per second squared, ms^-2
Give the SI unit and symbol for density.
Kilograms per cubic metre, kgm^-3
Give the SI unit and symbol for electric charge.
Coulomb, big C
Give the SI unit and symbol for energy.
Joule, big J
Give the SI unit and symbol for force.
Newton, big N
Give the SI unit and symbol for momentum.
Kilogram metres per second, Kgms^-1
Give the SI unit and symbol for potential difference.
Volt, big V
Give the SI unit and symbol for power.
Watt, big W
Give the SI unit and symbol for pressure.
Pascal, Pa
Give the SI unit and symbol for velocity.
Metres per second, ms^-1
Abbreviation and standard form for the prefix: pico-
p, 10^-12
Abbreviation and standard form for the prefix: nano-
n, 10^-9
Abbreviation and standard form for the prefix: micro-
μ, 10^-6
