Bernoulli Blower

We scooped up Bernoulli Blower. Everyone did have fun trying this exhibit. We spotted Kaye and Jane trying. They placed the ball on top of the air nozzle and got on the bike then pedaled it. They took turns and pedaled the bike as fast as they can and the ball floated in the air. Do you know why that happened?
The ball stays afloat because the air from the blower exerts an upward force on the ball. The faster you pedal, the higher the ball will float.
When the ball is pulled partly out of the air stream, the air that is moving fast along the side of the ball exerts less sideways pressure on the ball than the still air in the room. The greater pressure of the surrounding air pushes the ball back to the center.