practical and investigative skills Flashcards
What are physical quantities?
Things you can measure - has to have a size and usually a unit
What are some examples of quantities that don’t have a unit?
Magnification and efficiency
How many base units are there?
7
What are derived units?
When a quantity doesn’t have its own unit, it is made from the base units
How are newtons expressed in base units?
kgms-2
How are pascals expressed in base units?
kgm-1s2
How are joules expressed in base units?
kgm2s-2
What is dimensional analysis?
Analysis using the fact that physical quantities equated with each other must be expressed in terms of the same base quantities (e.g. mass, length)
Prefix for 10^ -12?
pico (p)
Prefix for 10^ -9?
nano (n)
Prefix for 10^ -6?
micro (µ)
Prefix for 10^ -3?
milli (m)
Prefix for 10^ -2?
centi (c)
Prefix for 10^ 3?
kilo (k)
Prefix for 10^ 6?
mega (M)