When you blow air between a pair of closely-spaced Ping-Pong balls suspended by strings, the balls will swing
A)toward each other.
B)away from each other.
C)away from the air stream, but not necessarily toward or away from each other.

Question

Quizplus · Accepted Answer

When air is blown between two closely-spaced Ping-Pong balls, they will swing toward each other due to the Bernoulli principle, which states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure. The fast-moving air between the balls creates a low-pressure zone, causing the higher pressure surrounding the balls to push them together.

When You Blow Air Between a Pair of Closely-Spaced Ping-Pong