Ch. 13Lesson 4

What are simple machines?

machine•device that changes the direction or the amount of force needed to do work

6 kinds of

inclined plane• slanting surface that connects a lower level to a higher level

inclined plane

screw• inclined plane wrapped around a center post

screw

wedge

lever•stiff bar that rests on a fulcrum

lever

lever

wheel and axle• ex: doorknob• wheel=knob• axle=post that

attaches to its center

wheel and axle

pulley • changes the direction of motion to which a force is applied

pulley

complex machine- made of more than 1 simple machine

complex machine

Edheads-Simple Machines

Simple Machines Game

• Simple Machines game• http://staff.harrisonburg.k12.va.us/

%7Emwampole/1-resources/simple-machines/index.html

• http://sunshine.chpc.utah.edu/javalabs/java12/machine/index.htm

• http://www.galaxy.net/~k12/machines/index.shtml • http://www.quia.com/pages/

hostetterscience.html#simple • How can we move our principal game