Yes, you're describing an inclined plane, which is one of the six simple machines.

Here's why it fits the description:

* Flat surface: The inclined plane is a flat surface.

* One end higher than the other: This creates the slope that is essential for the inclined plane's function.

The inclined plane allows you to move an object vertically with less force than lifting it straight up. Think of a ramp, a slide, or even a hill.