Multiple choice

What happens if a stream of air is blown through a tube under one of the pans of a physical balance in equilibrium?

  1. The pan will go up

  2. The pan will not be affected

  3. The pan will go down

  4. The pan will oscillate
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When air is blown through a tube under a pan of a physical balance, the increased velocity of air creates lower pressure (Bernoulli's principle). This pressure difference pushes the pan downward. The pan doesn't go up or oscillate - it experiences a net downward force.

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