Tuesday, April 19, 2011

EGGtreme Spin

Science in a Van love theme parks.  However, after a rollercoaster ride they feel sick!  Why?  All the liquid and soft stuff in our bodies move about and we get all shook up. 

In the following eggperiment you will see the effect of having moving liquids inside of an object.

For this experiment you will need:
  • 1 raw egg
  • 1 hard-boiled egg
  • 1 marker pen

Spin the eggs and observe. One should be behaving differently. Label this egg X.  And label one of the others Y.  Spin the eggs gently then stop them by touching them softly.   As soon as they stop, let them go.   

When the eggs were spinning, how did egg X behave differently?
Can you predict why this happened?

Can you pick the hard boiled egg? Smash it on your head. Are you right?

When we spun our eggs, one egg rotated smoothly and two eggs were very wobbly.  After we marked them up, egg X stopped when touched but the other eggs spun little longer. 

Why? A boiled egg is solid and raw eggs are full of liquid. When spinning the solid egg everything moves all together which produces a smooth motion. In the raw egg the weight of the yoke is moving around in the white and is causing it to wobble.

Why does the raw egg want to keep moving when we try and stop it?  Well, the force that has been applied to the shell gets passed to the liquid inside. Even when we stop the shell, the liquid inside keeps moving.  The force of the liquid moving inside the egg then transfers to the shell on the outside.
Check back tomorrow for another eggperiment.

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