| @ricainrico: Some people view a screw as a curved inclined plane but a screw converts rotational motion into linear motion, which an ordinary inclined plane doesn't. A wedge is usually thought of as a moving inclined plane — for example, the kind of wedge that you'd hammer into something to split it. So, if you push your door wedge under the door, you're using it as a wedge; if you pull the door onto the wedge, it's an inclined plane. :-) |