Answer the following in brief:
Why is straight-line motion called one-dimensional motion, whereas motion in a plane is called two-dimensional motion? Explain by comparing the two.
| Straight-line Motion | Motion in a Plane |
|---|---|
| The object moves along a . | The object moves in on a flat surface. |
| It is because only one coordinate is needed to describe its position. | It is because two coordinates are required to describe its position. |
| The throughout the motion. | The during the motion. |