Pdfa1_1

Chapter 1

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Introduction To Physics

1

Base Quantities & Derived Quantities Base Quantities Measuring Instruments Length l

Mass m

Time t

meter m

kilogram kg

second s

Temperature Electric Current T I kelvin K

ampere A

SI Unit

Derived Quantities Quantity Volume Density

Relationship

Derived unit

Length × Breadth × Height Mass Volume

m3 kg m–3

Acceleration

Change of velocity Time taken

m s–2

Momentum

Mass × Velocity

kg m s–1

SI Prefixes & Symbols Prefix Symbol Value Example 1

Example 2

tera giga mega kilo hecto deca deci centi milli micro nano pico T

G

M

k

h

da

d

c

m

μ

1012

109

106

103

102

101

10–1

10–2

10–3

10–6

19.2 nanometer = 19.2 nm

52.8 gram 10−5

n

p

10–9 10–12

(Scientific notation)

= 19.2 × 10–9 m

(Conversion to SI unit)

= 1.92 × 10–8 m

(Standard form)

= 52.8 × 105 g

(Scientific notation)

= 52.8 × 105 × 10–3 kg

(Conversion to SI unit)

= 5.28 × 103 kg

(Standard form) © Marshall Cavendish ( Malaysia ) Sdn. Bhd.