I have two eggs, both with their shells on. One egg is raw and the other is boiled. Is there a way by which I can tell which egg is boiled without cracking open the shells?

What you do:

  1. Place eggs ‘A’ and ‘B’ on a flat table top.
  2. Gently place your fingers on egg ‘A’ and turn it around so that it begins to spin. Take your fingers away.
  3. Make egg ‘B’ spin the same way.
  4. Then stop egg ‘A’ from spinning, again with the gentle touch of your fingers.
  5. Similarly stop egg ‘B’ from spinning.

Conclusion

Egg ‘A’ is the boiled egg. It started spinning   when you gave it the right force and stopped when you applied the right force. It behaved like one solid body because it was boiled.

In the case of egg ‘B’, it turned around clumsily because the liquid yolk and white were resisting the force.

Due to inertia, the liquid inside did not start moving immediately – hence the clumsy wobble.

It was not easy to stop it immediately because the liquid yolk and white which were in motion took time to stop even though the shell had stopped, again because of inertia.

What did you notice?

That egg ‘A’ started to spin immediately unlike egg ‘B’, which merrily turned around clumsily.

That egg ‘A’ stopped spinning also almost immediately when you tried to stop it but egg ‘B’ wobbles and took a longer time to stop.

Picture Credit : Google

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