Aramp or inclined plane can make lifting something or climbing a certain height easier
( use less force ). but there is a trade off ? what is it?

The way an inclined plane works is that to save effort, you must move things a greater distance
The longer the distance of the ramp, the easier it is to do the work. It will take a much longer time to do the work
 The shallower the ramp, the easier it is to move the object. The trade-off is that you must move the object farther to lift it to the same height 

Is there a picture of the diagram?