There are six widely recognized types of simple machines used in basic physics and engineering.

Quick Scoop

In school science and most engineering references, simple machines are defined as basic devices that change the size or direction of a force to make work easier. Over many years, scientists standardized this into a list of six main types.

The 6 simple machines

Most textbooks and educational sites agree on these six:

  • Lever
  • Wheel and axle
  • Inclined plane
  • Wedge
  • Screw
  • Pulley

Each of these provides a mechanical advantage by letting you apply a smaller force over a longer distance or by redirecting the force to a more convenient direction.

Mini explanations

  • Lever : A rigid bar that pivots on a fulcrum to lift or move loads with less effort, like a seesaw or crowbar.
  • Wheel and axle : A large wheel fixed to a smaller axle so turning one helps move or turn the other more easily, like a doorknob or bicycle wheel.
  • Inclined plane : A sloping surface that lets you push a load up gradually instead of lifting it straight up, like a ramp.
  • Wedge : Basically a moving inclined plane used to split or secure objects, like a knife, axe, or doorstop.
  • Screw : An inclined plane wrapped around a cylinder, used for fastening or lifting, like bolts or jar lids.
  • Pulley : A grooved wheel with a rope or cable that changes the direction of a pulling force and can reduce the effort needed to lift loads.

Tiny “forum-style” note

If you scroll through science forums or Q&A threads, you might see people ask whether there are more than six simple machines, especially when they notice variations like different classes of levers or compound devices. The usual answer is that those are combinations or subtypes, but the core list still counts six basic simple machines in modern teaching.

TL;DR: When someone asks “how many types of simple machines are there,” the standard answer is six : lever, wheel and axle, inclined plane, wedge, screw, and pulley.

Information gathered from public forums or data available on the internet and portrayed here.