Motion in a spacetime diagram is depicted by different kinds of lines. Each line's slope provides insights into an object's velocity and motion characteristics.
For example, a tilted line represents an object that's moving over time, while a vertical line shows a stationary body. If we have a slanted line moving towards the right, this indicates the object is moving forward in space as time progresses.
There are different types of motion that can be displayed:
- **Vertical line**: This shows a stationary body with no movement through space.
- **Diagonal line**: Indicates movement at a constant velocity because space and time both change proportionally.
- **Horizontal line**: This is theoretically impossible since it would mean moving through space with no passage of time, breaking the laws of physics.
Thus, motion in spacetime diagrams gives us a clear snapshot of how position and time interact.