Here's why:

* Inclined Plane Definition: An inclined plane is a flat surface set at an angle to a horizontal surface. This angle makes it easier to move objects up or down a vertical distance.

* Ladder Function: A ladder acts like an inclined plane, allowing you to reach a height by climbing up its sloped surface instead of going straight up.

Think of it this way: Climbing a ladder is like walking up a ramp. You're using the angled surface to reduce the effort needed to reach the top.