A simple machine alters the size or direction of a force. The simplest machines include the lever and and the inclined plane. The pulley, wheel and axle, wedge, and screw are also examples of variations of the lever and inclined plane. All machines, no matter how complicated, are made up of one or more simple machines. Machines help to make work easier, but they need a force and energy in order to be able to do work or move an object.
We can use machines to
1) transfer forces from one place to another
2) increase the amount of force
3) change the direction of the force
4) increase the speed of doing work
A ramp is an inclined plane.
An object can be moved on an inclined plane without actually being lifted. The inclined plane reduces the force neede to push or pull an object to a desired level. Less force is needed using the inclined plane than if you were to lift the object straight up. However, when using the inclined plane, the object must be moved over a greater distance to reach the desired level. Therefore, inclined planes make work easier, but do not ultimately save energy.