The machine which is responsible for changing the direction of application of force:
Wheel
Wedge and screw are a modified form of an inclined plane. See-saw is a type of class I lever. Pulley is a simple machine used to change the direction of force applied to lift the load.
Example: Lifting water from a well using a pulley. In the above case even though we apply force in the downward direction the load( bucket full of water) is moving in the direction opposite to the direction of application of force.