This PowerPoint covers the introduction in Physics

1. MEASUREMENT

2. Physical Quantity
A physical quantity that can be measured and described
by a number is called physical quantity.
Examples:
Mass of a person is 50kg .
Length of a curtain is 3m.
Area of a hall is 200𝒎𝟐
Temperature of a room is 298K.

3. Types of Physical Quantities
1. Fundamental Quantities
The physical quantities which do not
depend on other physical quantities
for their measurement are known as
fundamental quantities:
Example:
Mass Time
Length Temperature
2. Derived Quantities
The physical quantities which
depend on one or more
fundamental quantities for their
measurement are known as derived
quantities quantities:
Example:
Area Speed
Volume Force

4. Measurement
Measurement is the act of determining
matters’ size, length, weight, capacity or other
aspect. When you measure you compare the
material’s basic properties with the accepted
international standards.

5. Units of
Measurement
The standard used for the
measurement of a physical
quantity is called a unit.
The Table shows a seven
base SI Unit.
Quantity Unit Symbol
Length meter m
Mass kilogram kg
Temperature kelvin K
Time second s
Amount of
Substance
mole mol
Luminous Intensity candela cd
Electric Current Ampere A

6. Derived
Units
Quantity unit Symbol
Volume cubic meter m3
Density kilograms per cubic meter kg/m3
Speed meter per second m/s
Newton kg m/ s2 N
Energy Joule (kg m2/s2) J
Pressure Pascal (kg/(ms2) Pa

7. System of Units
1. CGS- it is based on cm,g,s,as fundamental units of length, mass and time.
2. MKS-it is based on m,kg,s,as fundamental units of length, mass and time.
3. FPS-it is based on foot,pound and second,as fundamental units of length,
mass and time.
4. SI-Fundamendal unit

8. Scientific Notation
- is a method of writing a very large or a very small number.

9. Conversion
Factor

11. Accuracy and Precision
Accuracy refers to how close a
measured value is to the actual
(true).
Precision on the other hand, refers
to how close the measured values
are to each other.

12. Accurate Measurement

13. Parallax error