Assume your standing at this point. Now if your friend tells you,
there is a treasure pot 50 kilometers away from home.
How long will you take to find it?
Which direction will you go? It could be here or here or maybe here.
It is hard to know where exactly it is.
You are only provided the distance
which is one dimensional information.
One dimensional information like this, is called a scalar quantity.
Your question to him would be, which direction from home?
When you are told that it's 50 kilometers in the northeast direction!
You have the precise information of the location.
This now becomes two dimensional information,
distance and direction.
The treasure pot is over here.
Two dimensional information like this is called a vector quantity.
Scalar quantities are one dimensional
and vector quantities are two dimensional.
Speed is a very good example of what we call in physics a scalar quantity
indicating only magnitude but not specifying any direction.
So that's what scalar quantities are.
Only magnitude but no direction.
In the case of velocity however, the direction is stated
and that's why it is referred to as the vector quantity.
A vector quantity involves not just the magnitude but also the direction.
When you add directional information to speed it becomes,
a vector quantity called velocity.
The additional information makes it more specific.
Temperature change for example is one dimensional quantity.
But when we specify rising or falling temperature, it is two dimensional.
If someone says that the temperature has changed by two degrees,
we won't really know if it has increased or decreased.
We will look at various scalar and vector quantities
in the next few tutorials and for as long as we study physics.
Speed, velocity, distance, displacement, mass, weight, force, acceleration.
The more we look at these the clearer this concept will become.
