PHYSICS NOTES
24/01/2013
Chapter 1: Introduction to
Physic
1.1 Understanding Physics
• A phenomenon is an occurrence that can be perceived by our senses
• In physics, we study natural phenomena, such as the eruption of volcano, rain fall, formation of rainbow and the properties of matter, such as length, temperature, volume
• There are many fields of study in physics, including force, motion, heat, light, waves, electricity, electromagnetism, electronics and nuclear physics
1.2 Physical Quantities
• We discover physics by learning how to measure the quantities that are involved in physics and we call its as physical quantities.
• A physical quantity is a quantity that can be measured • A physical quantity can be divided into base quantity and derived quantity
© CYCK 2013
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24/01/2013
1.2.1 Base Quantities
• Base quantities is a quantity that cannot be defined in term of other physical quantity.
• There are five base quantities:
Physical Quantity
S.I. Unit
Base Quantity
Quantity Symbol
S.I. Unit
Length
l
metre
Unit symbol m Mass
m
kilogram
kg
Time
t
second
s
Electric Current
I
ampere
A
Temperature
T
kelvin
K
1.2.2 Derived Quantities
• Derived quantities are physical quantities consisting of combinations of base quantities., by multiplication, division, or both operations.
• Derived quantities as well as their units are expressed in terms of base quantities and base S.I. units as follows:
Example 1:
© CYCK 2013
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24/01/2013
Derived Unit
The derived unit is a combination of base units through multiplying and/or dividing them
Example 2:
Derived quantities
(symbol)
Area
(A)
Expressed in base quantities A=lx l
Volume
(V)
V=lxlxl
Density
(ρ)
Ρ=
Speed
(v)
v=
Work or Energy
(W or E)
© CYCK 2013
m
V
l t W=Fs
F = force s = displacement
Derived units
Unit A = m x m
= m2
(read as square
Chapter 1: Introduction to
Physic
1.1 Understanding Physics
• A phenomenon is an occurrence that can be perceived by our senses
• In physics, we study natural phenomena, such as the eruption of volcano, rain fall, formation of rainbow and the properties of matter, such as length, temperature, volume
• There are many fields of study in physics, including force, motion, heat, light, waves, electricity, electromagnetism, electronics and nuclear physics
1.2 Physical Quantities
• We discover physics by learning how to measure the quantities that are involved in physics and we call its as physical quantities.
• A physical quantity is a quantity that can be measured • A physical quantity can be divided into base quantity and derived quantity
© CYCK 2013
1
24/01/2013
1.2.1 Base Quantities
• Base quantities is a quantity that cannot be defined in term of other physical quantity.
• There are five base quantities:
Physical Quantity
S.I. Unit
Base Quantity
Quantity Symbol
S.I. Unit
Length
l
metre
Unit symbol m Mass
m
kilogram
kg
Time
t
second
s
Electric Current
I
ampere
A
Temperature
T
kelvin
K
1.2.2 Derived Quantities
• Derived quantities are physical quantities consisting of combinations of base quantities., by multiplication, division, or both operations.
• Derived quantities as well as their units are expressed in terms of base quantities and base S.I. units as follows:
Example 1:
© CYCK 2013
2
24/01/2013
Derived Unit
The derived unit is a combination of base units through multiplying and/or dividing them
Example 2:
Derived quantities
(symbol)
Area
(A)
Expressed in base quantities A=lx l
Volume
(V)
V=lxlxl
Density
(ρ)
Ρ=
Speed
(v)
v=
Work or Energy
(W or E)
© CYCK 2013
m
V
l t W=Fs
F = force s = displacement
Derived units
Unit A = m x m
= m2
(read as square