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8/14/2019 sains 22-2-10
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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