September 11, 2012
While half of the class is making an animoto about simple machines
the other half is making a a marble ramp down and back up.
Lifting a ball against gravity gives potential energy. As it rolls down
it louses some energy to friction so does not go up as high.
The trick is to get the last part just right so the ball just goes to the end
(and rolls back instead of off.)
Then the other half made ramps.
Here is how to make the bends.
Here is another way that works.
