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Simple Machines
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6 Simple Machines
Introduction

Six Simple Machines

  1. Pulley
  2. Wedge
  3. Wheel and Axle
  4. Lever
  5. Inclined Plane
  6. Screw

Pulley

 

A wheel with a grooved rim in which a rope can run and so change the direction of a pull. It is a simple machine that is used to raise weights.

Wedge

 

A piece of wood or metal tapering to a thin edge, used in splitting or separating.

Wheel and Axle

 

Axle on which a wheel is fastened, used to lift weights by winding a rope onto the axle as the wheel is turned.

Lever

 

A bar which turns on a fixed support called a fulcrum and is used to transmit effort and motion.

3 Classes of Levers

  • First-Class Lever
  • Second-Class Lever
  • Third-Class Lever

First-Class Lever

  • The fulcrum is between the effort and the resistance
  • Motion in direction opposite effort

Second-Class Lever

  • Resistance between effort and fulcrum
  • Motion in same direction as effort

Third-Class Lever

  • Effort between resistance and fulcrum
  • Motion in same direction as effort.

Inclined Plane

 

Plank or other plane surface set at an acute angle to a horizontal surface.

Screw

 

A cylinder with an inclined plane wrapped around it and fitting into a threaded cylindrical hole. Screws are used in jacks to lift heavy loads.

 
Vocabulary Terms
  1. Pulley
  2. Wedge
  3. Wheel and Axle
  4. Lever
  5. First-Class Lever
  6. Second-Class Lever
  7. Third-Class Lever
  8. Inclined Plane
  9. Screw
 
Review Questions
 
 
Related Internet Links