Why does egg float upwards in stirred bottle of water?

  • Context: High School 
  • Thread starter Thread starter MulderFBI
  • Start date Start date
  • Tags Tags
    Egg Float Water
Click For Summary
SUMMARY

The discussion centers on the phenomenon of an egg floating upwards in a stirred bottle of water, attributed to the unique shape of the egg and the effects of centrifugal force. Participants suggest that the egg's shape allows it to rise to the widest part of the vessel when stirred, unlike other solid materials with similar weight. The conversation also highlights the importance of the vessel's design, specifically its bulging middle, in influencing the egg's movement. Experimentation with different objects and stirring techniques is encouraged to further understand this behavior.

PREREQUISITES
  • Understanding of basic physics principles, particularly buoyancy and centrifugal force.
  • Familiarity with experimental design and control variables.
  • Knowledge of fluid dynamics, especially in relation to object movement in liquids.
  • Experience with conducting and analyzing physical experiments.
NEXT STEPS
  • Explore the principles of buoyancy and Archimedes' principle in detail.
  • Research the effects of centrifugal force on objects in fluids.
  • Conduct experiments comparing various shapes and densities of objects in stirred liquids.
  • Investigate the impact of vessel design on fluid dynamics and object behavior.
USEFUL FOR

Students of physics, educators conducting hands-on experiments, and anyone interested in the principles of fluid dynamics and buoyancy phenomena.

MulderFBI
Messages
22
Reaction score
8
Hello, why does the egg float upwards in a stirred bottle of water? I have tried making same experiment with other objects in different shapes but only the egg shape seems to float upwards. Here's the link to the video:

Second experiment:


Thank you for help.
 
Physics news on Phys.org
Have you tried the 2nd experiment with solid materials having close to the same weight and shape as the egg? Have you tried the 2nd experiment with shaking the same way as the first experiment (rather than with a stirrer)?
 
  • Like
Likes   Reactions: MulderFBI and berkeman
For the second video I think it might also have something to do with the fact that the vessel bulges out in the middle. The centrifugal force will naturally make it go to the widest part of the vessel.
 
  • Like
Likes   Reactions: MulderFBI

Similar threads

  • · Replies 10 ·
Replies
10
Views
1K
Replies
9
Views
1K
  • · Replies 13 ·
Replies
13
Views
2K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 2 ·
Replies
2
Views
639
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 16 ·
Replies
16
Views
6K
  • · Replies 7 ·
Replies
7
Views
2K