phys quantity
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ADDITIONAL SCIENCEFORM 4
CHAPTER 1: PHYSICAL QUANTITY
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1.1 BASE QUANTITIES AND DERIVED QUANTITIES
Physical qua!i!y is a quantity that can be
"#asu$#% and consists of a numeica!
"a&i!u%# and a ui!'
Physical qua!i!y can be eithe (as#
qua!i!i#s o %#$i)#% qua!i!i#s'
*as# qua!i!y is a quantity that is +!c+"(i#% "ith one othe o moe
,hysical
qua!i!i#s'
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1.1 BASE QUANTITIES AND DERIVED QUANTITIES
A %#$i)#% qua!i!y is a c+"(ia!i+ of # o moe (as# qua!i!i#s'
*as# qua!i!y Sy"(+l +-(as# qua!i!y
SI ui! Sy"(+l -+$ !h# ui!
L#&!h l M#!$# "
Mass m .il+&$a" /&
Ti"# t S#c+% sT#",#$a!u$# T .#l)i .
El#c!$ic cu$$#! I A",#$# A
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1.1 BASE QUANTITIES AND DERIVED QUANTITIES
S+"# %#$i)#% ui!s ha$e s%ecific a"#s
such as ne"ton& 'ou!e and "att. (thes
'ust use combinations of the base units.
D#$i)#% qua!i!y Sy"(+l +-%#$i)#%
qua!i!y
R#la!i+ 0i!h (as# qua!i!y SI ui!
+lu"# V l#&!h 2"3 l#&!h 2"3 l#&!h2"3
"5
#l+ci!y v %is,lac#"#! 2"3!i"# 2s3
"s61
D#si!y ρ "ass 2/&3)+lu"# 2"53
/&"65
F+$c# F "ass 2/&3 acc#l#$a!i+ 2"s673 N 2#0!+3
El#c!$ic cha$&# Q cu$$#! 2A3 !i"# 2s3 C 2c+ul+"(3
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1.1 BASE QUANTITIES AND DERIVED QUANTITIES
P$#-i Sy"(+l M#ai&
T#$a T 1 888 888 888 888 9 1817
i&a 1 888 888 888 9 18;
M#&a M 1 888 888 9 18<
.il+ / 1 888 9 185
D#ci % 1=18 9 1861
C#!i c 1=188 9 1867
Milli " 1=1888 9 1865
Mic$+ > 1= 1 888 888 9 186<
Na+ 1= 1 888 888 888 9 186;
Pic+ , 1= 1 888 888 888 888 9 18617
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1.1 BASE QUANTITIES AND DERIVED QUANTITIES
)any ,hysical qua!i!i#s ha$e )#$y la$&#
o )#$y s"all )alu#' Thus& "e "ite them
in scientific notation* ) + 1,n
1 - ) - 1, and n is an intee
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1.# S/A0AR AND VE/T(R QUANTITIES
A scala$ qua!i!y has "a&i!u%# but +
%i$#c!i+' E+am%!es of sca!a quantities
ae l#&!h? "ass? !i"#? !#",#$a!u$#? cu$$#! and s,##%'
A )#c!+$ qua!i!y has both "a&i!u%# and
%i$#c!i+' E+am%!es of $ecto quantitiesae )#l+ci!y? -+$c# and %is,lac#"#!'
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1.# S/A0AR AND VE/T(R QUANTITIES
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1.# S/A0AR AND VE/T(R QUANTITIES
S,##% is a scala$ qua!i!y' #l+ci!y is a )#c!+$ qua!i!y
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1.# S/A0AR AND VE/T(R QUANTITIES
Thee ae many situations "hee a%%i!i+s
of )#c!+$s ae in$o!$ed in s+l)i& %aily
,$+(l#"s' The !+!al l#&!h of these # !ines e%esent a #0 )#c!+$'
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1.# S/A0AR AND VE/T(R QUANTITIES
Addition of $ectos in the same diection
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1.# S/A0AR AND VE/T(R QUANTITIES
Addition of $ectos in the o%%osite diection
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1.# S/A0AR AND VE/T(R QUANTITIES
Addition of $ectos 'oined headtotai!
2tian!e method3
R#sul!a! -+$c#
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1.# S/A0AR AND VE/T(R QUANTITIES
Addition of $ectos 'oined headtohead o
tai!totai! 2%aa!!e!oam method3
R#sul!a! -+$c#
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