- Inclined plane: inclined plane can't move but but it lets move things on it like heavy things.It lets you use less effort by not lifting object. Its sloped surface for example like stairs and sildeless inclined plane less effort. large load gets less effort but you need to move the load longer distance.Inclined plane gives you machanical advantage beacause you uses less effort to lift object.
- Wedge: wedge can make objects hold , lift , and push its mostly like inclined plane shape but it has handle beside wedge can work if you push on the thickest spot and that gives you a mechanical advantage by changing the direction of your force The first wedges were rock or stick shaprd in to arrows or spears.wedges are made to make objects take apart.people thought that sharpening the wedge was increased it's machanical advantage becaus less effort force was needed to use it.
- Screw: screw can hold an objects. it's mostly shape of a inclined plane but screw is like pole that is warped in in clined plane.when the threads of screws are closer to each other , you use less effort force to put the screw in the wood because the length of the inclined plane is longer.when you are increasing the legth of the screw it's same thing as that to must turn the screw to drive into something . It's same disvantage that incline plane has use less effort force to move greater distance.