- #1

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**1)**For 1D motion, there are only two possible directions, so they can be represented by just a

**+**or

**-**sign, where you have to define which direction is positive and which is negative.

But for 2D how do you represent the direction of a vector? Clearly, just + or - will not do the job. I thought of a few ways to completely describe the direction of a vector in 2D:-

**Using words**such as*North, North East, left, right*etc. but this isn't precise and will not suffice for vectors that aren't in the 8 simple directions.**Defining a line**like an x-axis, and using the*angle the vector makes with the defined line*to describe it's direction.**Defining x and y axes**and then*resolving the vectors along the axes*. So the vector will be expressed as the sum of an x-component and a y-component with + and - signs representing the directions of the components along their respective axis.

So what method do people use to describe direction of vectors in 2D?

**2)**When we are drawing displacement-time graphs, along the displacement axis there is only + and -. So does this mean that we can draw displacement-time graphs for motion in 1D?