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Rev. Notes > AS > Physical quantities and units
 
 
Previous Topic Physical quantities and units Next Topic

Topics
 

Physics

Areas of Physics

Interdisciplanary areas of physics

Quantities in Physics

Base Units

Convention for indicating units

Derived Units

S.I. Units (International System of Units)

Supplementary units

Homogeneity of equations

Significant figures

Rules of Significant figures

Further discussion on Significant figures

Dimensions

Scientific notation

The Avogadro's Constant

Scalars and Vectors

Addition and subtraction of co-planar vectors

Rectangular components of a vector

 

Scalars and Vectors

Scalars: Scalar quantities have magnitude only.

Vectors: Vector quantities have both magnitude and directions.

Example of each type of quantity are given in table below.

Scalars

Vectors

Distance
Speed
Mass
Energy (work)
Volume
charge

Displacement
Velocity
Force (weight)
Acceleration
Momentum
Torque

Two vector quantities are equal only if they have the same magnitude and same direction.

Vectors can be represented by a line drawn in a particular direction. The length of the line represents the magnitude of the vector; the direction of the line represents the direction of the vector.

In print, vector quantities are indicated by using bold type (e.g. F) or by using an arrow (e.g. F). The same symbol without the use of either bold type or an arrow (e.g. F) represents the magnitude of the vector.
 

 
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View Comments on this Chapter - Total Comments (4)
 
Student Said :

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  11/07/15 09:09 AM
   
Kennyworthy Mphande Said :
nicely explained.
 
  26/01/15 07:00 PM
   
benard wilson Said :
very good notes and easy to understand. i wish u can make more of dem
 
  10/09/14 09:57 PM
   
muhammad fawad Said :
nice writting..
 
  06/05/14 06:47 PM
 

 

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