A long narrow wedge requires a small effort force to overcome a great resistance force. A screw is a circular inclined plane. It appears to be an inclined plane wound around a center to form a cylinder. It requires a small effort force in turning to overcome a large resistance force. Machines are used to change force.
Machines change the amount of force.
When you use a bottle opener you increase the amount of force. You can't open an old-fashioned coke bottle with your bare fingers. But the opener changes the amount of force under the cap and pushes the top off. Machines change the amount of speed of force. A conveyor belt is an example of this.