Physics Units and Measurements PDF

***[PHYSICS.]*** ***[Units and Measurements.]*** - ***Fundamental quantities and units.*** - ***The basic quantities/units that other quantities are derived from. e.g.*** - ***Time(t) -- seconds(s)*** - ***Distance(s) -- metres (m)*** - ***Mass(m)...

***[PHYSICS.]*** ***[Units and Measurements.]*** - ***Fundamental quantities and units.*** - ***The basic quantities/units that other quantities are derived from. e.g.*** - ***Time(t) -- seconds(s)*** - ***Distance(s) -- metres (m)*** - ***Mass(m) -- kilograms (kg)*** - ***Light intensity -- candela (cd.)*** - ***Electric current(I) -- ampere (A)*** - ***amount of a substance(mole) -- mole (mol.)*** - ***Submultiples and multiples of units.*** - ***English words used to describe gradations.*** - ***Multiples talk about things in increasing sizes.*** - ***Submultiples talk about things in reducing sizes.*** ***Submultiples.*** ***Multiples.*** ---------------------- ---------------------- ***10^-1^ - deci*** ***10^1^ -- deca*** ***10^-2^ - centi*** ***10^2^- hecta*** ***10^-3^ - milli*** ***10^3^- mega*** ***10^-6^- micro*** ***10^6^- hexa*** ***10^-9^- nano*** ***10^9^ -- giga*** ***10^-12^ -pico*** ***10^12^ -- tera*** - ***Derived quantities and units.*** - ***Quantities and units gotten/derived from fundamental quantities. e.g.*** - ***area = m^2^*** - ***volume(V) = m^3^*** - ***velocity(v) = ms^-1^*** - ***acceleration(a) = ms^-2^*** - ***weight = N*** - ***force(F) = N*** - ***Dimensions of physical quantities.*** - ***v = distance/time(L/T)*** - ***F= mass x acceleration*** - ***a = velocity/time*** - ***V = length x breadth x height*** - ***Measurements.*** - ***The act of quantifying objects.*** - ***Take measurements along your line of sight to avoid parallax errors.*** - ***Measurement of lengths.*** - ***Metre rule- 1 metre*** - ***Measuring tape- more than 1 m*** - ***Builders tape- up to 1 km*** - ***Ruler- 30 cm*** - ***Vernier callipers-external and internal diameters of circular objects, depths of objects.*** - ***Micrometre screw gauge*** - ***Measurement of time.*** - ***Calendar -- days, weeks, months, years*** - ***Wristwatch -- hours, minutes, seconds*** - ***Stopwatch -- seconds, nanoseconds*** - ***Measurement of mass and weight.*** - - ***Measurement of volumes.*** - - ***Degree of accuracy.*** -