Q175 / 200 · Manipal (MET) 2011 · Physics

In which case does the potential energy decrease?

  • A
    On compressing a spring
  • B
    On stretching a spring
  • C
    On moving a body against gravitational force
  • Correct answer
    D
    On the rising of an air bubble in water

Solution

When an air bubble rises in water, it moves upward due to the buoyant force. As it rises, its gravitational potential energy might increase slightly, but the total potential energy (gravitational + potential energy from pressure) decreases because the bubble moves from a high-pressure region (deeper in water) to a lower-pressure region (near the surface).

Hence, the correct answer is option: 'D'.

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