Entropy falling objects

  • Thread starter kimpantip
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  • #1
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Dear sir,

Hi, Everyone. I have a question about entropy. If the object falls without air resistant (vacuum system) , Is entropy changed? If ΔS=0, it means reversible, is it possible that the object can go back to the original height? I know that it is impossible but can we explain that ΔS >0.
Within the condition as following:
*** Focus on within the space (free falling under gravity)

Thank you very much
Sincerely,
 

Answers and Replies

  • #2
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If the object falls without air resistant (vacuum system) , Is entropy changed? If ΔS=0, it means reversible, is it possible that the object can go back to the original height?
What do you think?

I know that it is impossible
Why? Assuming there are no other mechanisms where energy gets lost (inelastic collisions for example).
 
  • #3
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What do you think?

Why? Assuming there are no other mechanisms where energy gets lost (inelastic collisions for example).

The thing that I wonder is how can entropy increase while the object is falling in spite of no air resistant and no collision on the ground.
 
  • #4
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That's my question: why do you think it would increase?
 
  • #5
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why do you think it would increase?
ifΔs=0 it reversible, object is able to rise!!!! so i think that Δs>0
 
  • #6
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ifΔs=0 it reversible, object is able to rise!!!!
Sure it is, and it will do so after a perfect elastic collision (or a frictionless U-shaped ramp).
 

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