October 24, 2011
Some used WeDo and some used the simple machine sets.
Gears that mesh can move each other.
The two big 40 tooth gears move the same direction when there is an idler gear between.
A larger driver gears makes the little gear turn fast.
A small driver gear makes a large gear turn slowly.
We can make the gear turn with a motor.
Many gears turn when they all mesh.
The bird goes tweet tweet when it flaps its wings.
