unit and measurement

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UNIT AND MEASUREMENT
TOPIC 1 (Part 1)

2. / 11
Physical Quantity is a quantity that has a
numerical value and a unit of measurement.
Example : kg Non-Physical Quantities
(emotional quantities)
Sad, Happy, Anger
2
Kuantiti fizik ialah kuantiti yang mempunyai
nilai numerik dan unit pengukuran.
1
by ABA 2

3. / 11
Base Quantity is a quantity that cannot
be defined in terms of other quantities.
Base Quantities SI Unit name SI symbol
Length meter m
Mass kilogram kg
Time second s
Current ampere A
Temperature Kelvin K
Amount of substance mole mol
Luminous intensity candela cd
Kuantiti asas ialah kuantiti yang tidak
boleh ditakrifkan oleh kuantiti lain.
1
by ABA 3

4. / 11
Derived Quantity is a quantity that can be obtained and expressed in
terms of base quantity or combination of few base quantities.
Derived quantities Base Quantities S.I Unit
Velocity Length and time ms
Acceleration Length and time ms
Force Mass, length and time kgms , N
Pressure Mass, length and time kgm s , Pa, Nm
Energy Mass, length and time kgm s , J
Power Mass, length and time kgm2s , W
Frequency Time s , Hz
Volume Length mm3, cm3 ,m3
Area Length mm2, cm2 ,m2
Density Mass, Length Kg/m3
Work Mass, length and time kgm s , J
Weight Mass, length and time kgms , N
by ABA 4

5. / 11
Conversion of Units
(British to SI Unit)
8 𝑓𝑒𝑒𝑡 𝑡𝑜 meter
= 8 𝑓𝑡 ×
0.3048
1
= 8 × 0.3048 = 2.44 𝑚
① ②
Coversion Factor :
1 feet = 0.3048 meter
×
𝑚
𝑓𝑡
③
by ABA 5

6. / 11
Prefix Symbol Power of Ten
ato a 10-18
femto f 10-15
pico P 10-12
nano N 10-9
micro 𝜇 10-6
mili m 10-3
centi c 10-2
deci d 10-1
deka da 10
hekto h 102
kilo k 103
mega M 106
giga G 109
tera T 1012
PREFIX
Prefix
yang biasa
digunakan
dan wajar
dihafal.
by ABA 6

7. / 11
1 m = ? cm
1 meter= 102
(10−2
) meter
1 meter= 102 centi meter
1 m = 102 cm
Contoh : Penggunaan Prefix
c = centi (10-2)
by ABA 7

8. / 11
1 cm = ? 𝑚m
1 centi meter = ? mili meter
1 (10−2
) 𝑚𝑒𝑡𝑒𝑟 = 10(10−3
) meter
1 cm = 10 𝑚m
Contoh : Penggunaan Prefix
c = centi (10-2) m = mili (10-3)
by ABA 8

9. / 11
1 MHz = ? 𝑘Hz
1 Mega Hz = ? kilo Hz
1 (106
) Hz = 103(103
) Hz
1 MHz = 103 kHz
Contoh : Penggunaan Prefix
M = mega (106) k = kilo (103)
by ABA 9

10. / 11
Conversion of Units
5𝑐𝑚2
𝑡𝑜 𝑚2
= 5𝑐𝑚2
×
𝑚
𝑐𝑚2
1
10
3
2
1 km = 10 m
1 m = 10 cm
1 cm = 10 mm
1 hr = 60 min
1 min = 60 s
1 hr = 3600 s
HAFALKAN
3
3
3
1 kg = 10 g
1 g = 10 miligram
1 L = 10 mililiter
2
①
②
④
③
⑤
by ABA 10
= 5𝑐𝑚2
× 4
1
10
𝑚2
𝑐𝑚2 ⑥
⑦
= 5 × 10−4
𝑚2

11. / 11
Conversion of Units
30 𝑘𝑚 ℎ𝑟 𝑡𝑜 𝑚 𝑠
= 30
𝑘𝑚
ℎ𝑟
×
𝑚
𝑘𝑚
×
ℎ𝑟
𝑠
3
10
1
1
3600
=
30×103
1×3600
= 8.33
𝑚
𝑠
Conversion
Factor
① ②③ ⑤ ④
3
2
1 km = 10 m
1 m = 10 cm
1 cm = 10 mm
1 hr = 60 min
1 min = 60 s
1 hr = 3600 s
3
3
3
1 kg = 10 g
1 g = 10 miligram
1 L = 10 mililiter
by ABA 11

12. / 11
Conversion of Units
900 𝑔𝑚 𝑐𝑚3
𝑡𝑜 𝑘𝑔 𝑚3
= 900
𝑔𝑚
𝑐𝑚3
×
𝑘𝑔
𝑔𝑚
×3
1
10
=
900×1×106
103×1
= 9 × 102
× 106−3 𝑘𝑔
𝑚3
3
2
1 km = 10 m
1 m = 10 cm
1 cm = 10 mm
1 hr = 60 min
1 min = 60 s
1 hr = 3600 s
HAFALKAN
3
3
3
1 kg = 10 g
1 g = 10 miligram
1 L = 10 mililiter
𝑐𝑚
𝑚
2
10
1
3
① ② ④
⑤
③ ⑥
= 9 × 105
𝑘𝑔
𝑚3
by ABA 12