Why does a rotating coasting system slow down when a slice of bread is added?

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Homework Statement



Why does a coasting rotating system slows down when a slice of bread is put on it?


Homework Equations





The Attempt at a Solution

 

Discussion

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as the mass increase moment of inertia increase so it slows down the system
am i right?
 
What equation in physics are you thinking of that says that?
 

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