Work Energy And Power Question 56
Question: In which case does the potential energy decrease [MP PET 1996]
Options:
A) When compressing a spring
B) On stretching a spring, Hooke’s Law states that the force required is directly proportional to the displacement from the equilibrium position.
C) When moving a body against gravitational force
D) On the rise of an air bubble in water
Show Answer
Answer:
Correct Answer: D
Solution:
In compression or extension of a spring work is done against restoring force.
In moving a body against gravity work is done against gravitational force of attraction.
It means in all three cases potential energy of the system increases.
But when the bubble rises in the direction of the upthrust force, the potential energy of the system decreases.
BETA
