• a hairdryer
• a ping pong ball

1. Turn the hairdryer on the high, cool setting and point it straight up.
2. Hold the ping pong ball over the air stream, and let go. The air pushes the ball right up.
3. Now tilt the hair dryer. You would think that the air would just send the ball flying away! But watch... the ball stays trapped in the air stream!

Toward which clock position can you tilt the hairdryer without sending the ball flying?

1 o'clock
2 o'clock
3 o'clock

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