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6 Cards in this Set

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Quantities can be measured in:

Various units.

The dimension of a quantity:



1) Refers to?


- E.g.


2) The dimension is?

1) What is being measured.


- E.g. Length, time, mass etc.



2) Not the same as the unit in which the quantity is measured.

When measuring quantities/dimensions:



1) We (normally) use?


- E.g. Time...

1) A set of 'standard' units.


- E.g. Time is measured standardly in seconds.

There are:



1) How many SI units?


2) However, we need to know?

1) There are 7 SI units.



2) We only need to know of 6, the one we don't need to know is the Candela which is the unit for light intensity.

We don't always use standard units:



1) For some dimensions we use?

Derived units.

Derived units:



1) Are formed from?


2) They often have?


- E.g. Force?

1) The multiplication, division or raising to a power of the standard units.



2) There own symbol and units.



- E.g. Force is measured non-standardly using 'newtons', which is derived from 'F = ma' → kg m⁻²