Physical Quantities, Units and Measurements
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what is a physical quantity?
it is a quantity that can be measured.
what does a physical quantity have?
it has a numerical magnitude and a unit.
what is the si unit for length?
metre (m)
what is the si unit for time?
second (s)
what is the si unit for mass?
kilogram (kg)
what is the si unit for temperature?
kelvin (K)
what is the operation we must use to convert a quantity from ‘prefix’ to ‘no prefix’?
multiply
what is the operation we must use to convert a quantity from ‘no prefix’ to ‘prefix’?
divide
what is the symbol and factor for giga?
10 to the power of 9; G
what is the symbol and factor of mega?
10 to the power of 6; M
what is the symbol and factor of kilo?
10 to the power of 3; k
what is the symbol and factor of deci?
10 to the power of -1; d
what is the symbol and factor of centi?
10 to the power of -2; c
what is the symbol and factor of mili?
10 to the power of -3; m
what is the symbol and factor of micro?
10 to the power of -6; (refer to symbol)
what is the factor and symbol of nano?
10 to the power of -9; n
what is the magnitude of planet earth (diameter)?
10 to the power of 7 m
what is the magnitude of moon (diameter)?
10 to the power of 6 m
what is the magnitude of height of tall mountain?
10 to the power of 3 m
what is the magnitude of length of football field?
10 to the power of 2 m
what is the magnitude of height of chair?
10 to the power of -1 m
what is the magnitude of width of paper?
10 to the power of -4 m
what is the magnitude of size of human cell?
10 to the power of -6 m
what is the magnitude of size of large molecule?
10 to the power of -9 m