Gears by Edward and Josh

Simple machines are a big help in life.  We can't do a lot without simple machines.  They make work faster and easier.  A scientist came and showed us how gears work.  Here are some examples of simple machines: a pulley, wedges, screw, inclined planes, wheel and axle.  There are a lot of simple machines.
      Gears are a circles with bumps on the edges.  The picture shows an example of  a gear a car has gear to move the wheels.  There can be several gears working together.  The bumps on the gears are called teeth.  The teeth are what turns gears. 
      We built sweepers with Lego's.  There are little gears, big gears,
and medium gears.
      Gears are in many different sizes and shapes and that's how gears work.