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hhaq170
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me2*
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combines metric system and (mks) (cgs) systems to create a single composite system of units
read carefully:
Physics is all about physical quantities in other words quantities that can be measured or determined numerically
there are many types:
1.scalars
2.vectors
3.base quantities
4. Derived quantities
etc...(these should be more than enough for a-levels)
you probably know scalars and vectors
base quantities are expressed in terms of base units
1.metre
2.kilogram
3.second
4.ampere
5.kelvin
6.candela
7.mol
and dervied quantities (such as speed , current, acceleration etc..)
are expressed as combinations of base units
example
speed=distance/time=metre/sec>> this contains two base units so its a derived physical quantity
get the idea?? Rep if you get it!
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hhaq170
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