If you break the airstream from the hair dryer, what happens to the ball? Why?
Can you make other balls float with the hair dryer?
What happens when two or more hair dryers are used together?
When you change the velocity of the air what happens? Why?
Do some research on Daniel Bernoulli, a Swiss mathematician and physicist, to find out how Bernoulli's Principle explains why objects heavier than air can float.
Take your obstacle course to the next level with a leaf blower, larger balls and hula hoops.