# How many simple machines do we have?

six simple machines
A.

### Why do we use simple machines?

Scientists define a simple machine as a device that alters either the direction or force of an object. There are six primary types of simple machines: pulley, screw, inclined plane, wheel and axle, wedge, and lever. These simple machines are used in more complex devices every day, making tasks much easier.
• #### What is an example of a pulley?

Examples of pulleys include: Elevators use multiple pulleys in order to function. A cargo lift system that allows for items to be hoisted to higher floors is a pulley system. Wells use the pulley system to hoist the bucket out of the well. Many types of exercise equipment use pulleys in order to function.
• #### How does a wedge make your life easier?

Simple machines help us make work easier by applying a force over a greater distance. This fundamental idea enables the inclined plane to lift heavy objects with little effort, the wedge to easily cut rigid objects in two, and the screw to multiply a rotational torque into a linear force.
• #### What are the 6 types of simple machines?

Usually the term refers to the six classical simple machines which were defined by Renaissance scientists:
• Lever.
• Wheel and axle.
• Pulley.
• Inclined plane.
• Wedge.
• Screw.

Updated: 11th December 2019