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6 Cards in this Set
- Front
- Back
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Quantities can be measured in: |
Various units. |
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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. |
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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. |
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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. |
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We don't always use standard units:
1) For some dimensions we use? |
Derived units. |
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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 |
