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    Physical Quantities

    A physical property that can bequantified

    Can bequantified =Can be measuredand calculated

    Physical quantity is also known asbase quantity

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    StandardForm

    One is very big and the other is very small -both of them are difficult to read and write.

    To make them easy, we write the in

    standard form of a x10n

    1 a < 10

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    Exercise

    Change these value into standard form

    1. 12 00 m = 1.2 x 103 m

    2. 0.0000074 g = 7.4 x 10-6 g

    3. 0.01 m = 1 x 10

    -2

    m4. 57300g = 5.7 x 104 g

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    Prefixes are used to representquantities that are too large or toosmall.

    Example :

    100 000 g of sugar

    0.00000045 g of gold

    Prefixes

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    Prefix symbol Numericalvalue Multiplyingfactor

    Giga G 1 000 000 000 x10

    Mega M 1 000 000 x10Kilo k 1000 x10

    centi C 0.01 x10

    Mili m 0.001 x10

    micro 0.000 001 x10

    9

    6

    3

    -2

    -3

    -6

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    3. Look at thevalue, positive or

    negative

    k = 103

    If positive, move the decimalpoint forwards

    550 000 m = 550 x 103 m

    = 550 km

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    Exercise

    1. 12 00 m = 1.2 x 103 m

    2. 0.0000074 g = 7.4 x 10-6 g

    = 1.2 km

    = 7.4 g

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    Exercise

    3. 0.01 m = 1 x 10-2 m

    4. 57300g = 57.3 x 103 g

    = 1 cm

    = 57.3 kg

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    Assessment

    1. Which of the following prefixes isCORRECTLY matched to its symbol?

    Prefix Symbol

    A Giga K

    B kilo h

    D mili C Mega M

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    3. Which of the following physical quantities isCORRECTLY matched to its SI unit symbol?

    Physical quantity SI unit symbolA Temperature C

    C Length kgD Mass m

    B Electric current A

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    Assessment

    4. Write each of the following values ina suitable prefix form.

    (a) 0.08 m

    (b) 6000 g

    (c) 0.007 A(d) 5500 m

    (e) 0.009 m

    = ___ cm

    = ___ kg

    = ___ mA

    = ___ km

    = ___ mma.8b.6c.7d.5.5e.9

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    Conclusion

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    Physical Quantity

    5 basic quantities

    Lengthmetre

    (m)

    Masskilogram

    (kg)

    Timesecond

    (s)

    Temperaturekelvin

    (K)

    Electriccurrent

    ampere(A)

    Measurement tool

    Metre

    rule

    Beam

    balance

    Thermometer Stopwatch Ammeter

    Lever

    balance