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General Physics 
Physical Quantities & Units 
AS level 
 
 
 
 
www.fahadsacademy.com
Page 2


General Physics 
Physical Quantities & Units 
AS level 
 
 
 
 
www.fahadsacademy.com
Quantitative Observations 
What can be measured with the 
instruments on an aeroplane? 
Qualitative Observations 
How do you measure 
artistic beauty? 
Physical Quantities 
Quantitative versus qualitative 
• Most observation in physics are quantitative 
• Descriptive observations (or qualitative) are usually imprecise 
www.fahadsacademy.com
Page 3


General Physics 
Physical Quantities & Units 
AS level 
 
 
 
 
www.fahadsacademy.com
Quantitative Observations 
What can be measured with the 
instruments on an aeroplane? 
Qualitative Observations 
How do you measure 
artistic beauty? 
Physical Quantities 
Quantitative versus qualitative 
• Most observation in physics are quantitative 
• Descriptive observations (or qualitative) are usually imprecise 
www.fahadsacademy.com
Physical Quantities 
• A physical quantity is one that can be measured 
and consists of a magnitude and unit. 
 
SI units are 
used in 
Scientific 
works 
Measuring length 
70 
km/h 
? 
4.5 m 
? 
www.fahadsacademy.com
Page 4


General Physics 
Physical Quantities & Units 
AS level 
 
 
 
 
www.fahadsacademy.com
Quantitative Observations 
What can be measured with the 
instruments on an aeroplane? 
Qualitative Observations 
How do you measure 
artistic beauty? 
Physical Quantities 
Quantitative versus qualitative 
• Most observation in physics are quantitative 
• Descriptive observations (or qualitative) are usually imprecise 
www.fahadsacademy.com
Physical Quantities 
• A physical quantity is one that can be measured 
and consists of a magnitude and unit. 
 
SI units are 
used in 
Scientific 
works 
Measuring length 
70 
km/h 
? 
4.5 m 
? 
www.fahadsacademy.com
Are classified into two types: 
• Base quantities 
• Derived quantities 
Physical Quantities 
Base quantity 
For example : is like 
the brick – the basic 
building block of a 
house 
Derived quantity  
For example : is like 
the house that was 
build up from a collection 
of bricks (basic quantity) 
www.fahadsacademy.com
Page 5


General Physics 
Physical Quantities & Units 
AS level 
 
 
 
 
www.fahadsacademy.com
Quantitative Observations 
What can be measured with the 
instruments on an aeroplane? 
Qualitative Observations 
How do you measure 
artistic beauty? 
Physical Quantities 
Quantitative versus qualitative 
• Most observation in physics are quantitative 
• Descriptive observations (or qualitative) are usually imprecise 
www.fahadsacademy.com
Physical Quantities 
• A physical quantity is one that can be measured 
and consists of a magnitude and unit. 
 
SI units are 
used in 
Scientific 
works 
Measuring length 
70 
km/h 
? 
4.5 m 
? 
www.fahadsacademy.com
Are classified into two types: 
• Base quantities 
• Derived quantities 
Physical Quantities 
Base quantity 
For example : is like 
the brick – the basic 
building block of a 
house 
Derived quantity  
For example : is like 
the house that was 
build up from a collection 
of bricks (basic quantity) 
www.fahadsacademy.com
Definitions :- 
 
 
• Base quantities 
are the 
quantities on the 
basis of which 
other quantities 
are expressed.  
• The quantities 
that are 
expressed in 
terms of base 
quantities are 
called derived 
quantities 
www.fahadsacademy.com
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