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A Level Physics
1. Introduction

1.1 SI Basic Units

Basic quantity unit ..
mass kilogram kg
length metre m
time second s
temperature Kelvin K
amount of substance mole mol
current ampere A
luminosity candela cd
1.2 Dimensions

MASS ( M ) TEMPERATURE ( q )
LENGTH ( L ) AMOUNT OF SUBSTANCE ( N )
TIME ( T ) CURRENT ( I )

1.3 Pre-fixes

sub-multiple pre-fix symbol . multiple pre-fix symbol
10-2 centi c . 103 kilo k
10-3 milli m . 106 mega M
10-6 micro m . 109 giga G
10-9 nano n . 1012 tera T
10-12 pico p . . . .


2. Uncertainty (Error) in Measurements

eg. maximum error of a metre rule = 1mm (graduation scale)

2.1 Adding Errors : If R = A + B + C___& the errors are___eA, eB, eC
__________________Then R = ( A + B + C ) ± ( eA + eB + eC )

2.2 Product of Errors : If R = $\displaystyle {\frac{{1}}{{x^n}}}$ ___with % error = $\displaystyle {\frac{{1}}{{x^n}}}$
___________________________________so that errors are a%, b%, c%
_____________________.Then R = $\displaystyle {\frac{{1}}{{x^n}}}$ ± ( a + b + c )%

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