It was pointed out that there is something confusing happening at 1:50.
Because of the multiply object attached to the mass number box, changing the mass of the body changes the force of the ghost, so that the force acts like gravity. However, you never get to see this behavior because clicking the large message box resets the force back to its original value, so that the more massive body moves more slowly in reaction to the same force, which is correct. I probably should have deleted the multiply object before shooting the tutorial.
Oct 15, 2012 at 12:07pm #260417