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[accordion title="1. Base and Derived Quantities"]
 Physical quantities are classified as base (or fundamental) quantities and derived quantities.
7 base quantities are chosen to form the base units.
Base Quantity 
Base Unit 
mass 
kilogram (kg) 
length 
metre (m) 
time 
second (s) 
electric current 
ampere (A) 
temperature 
kelvin (K) 
amount of substance 
mole (mol) 
luminous intensity 
candela (cd) 
 Any other physical quantities can be derived from these base quantities. These are called derived quantities.
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[accordion title="2. Prefixes"]
 Prefixes are attached to a unit when dealing with very large or very small numbers.
Power 
Prefix 

pico (p) 

nano (n) 

micro () 

milli (m) 

centi (c) 

deci (d) 

kilo (k) 

mega (M) 

giga (G) 

tera (T) 
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[accordion title="3. Homogeneity of A Physical Equation"]
 A physical equation is said to be homogeneous if each of the terms, separated by plus, minus, equality or inequality signs has the same base units.
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[accordion title="4. Uncertainty"]
 Absolute uncertainty of a measurement of can be written as . This means that true value of the measurement is likely to lie in the range to .
 Fractional uncertainty =
 Percentage uncertainty =
 If the values of two or more quantities such as and are measured and then these are combined to determine another quantity , the absolute or percentage uncertainty of can be calculated as follows:
 If , then
 If or , then
 If then
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[accordion title="5. Errors"]
 Systematic errors are errors that, upon repeating the measurement under the same conditions, yield readings with error of same magnitude and sign.
 Random errors are errors that, upon repeating the measurement under the same conditions, yield readings with error of different magnitude and sign.
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[accordion title="6. Accuracy and Precision"]
 The accuracy of an experiment is a measure of how close a measured value is to the true value. It is a measure of the correctness of the result.
 The precision of an experiment is a measure of how exact the result is without reference to what that the result means. It is a measure of how reproducible the results are, i.e. it is a measure of how small the uncertainty is.
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[accordion title="7. Vectors"]
 A vector quantity has magnitude and direction.
 A scalar quantity has magnitude only.
 Addition of vectors in 2D:
 Subtraction of vectors in 2D:
 Methods of finding magnitudes of vectors:
 resolution of vectors into perpendicular components
 by scale drawing
 using:
sine rule:
cosine rule:
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