You tie a stone to a string and whirl it around in a verticalcircle at constant

Question

You tie a stone to a string and whirl it around in a verticalcircle at constant speed. At what point in the motion would thestring be most likely to break?

I thought it was at no point inparticular, but that was incorrect. My other choices are at thenbottom of circle, at the top of circle. or when the stone is levelwith my hand (halfway between lowest and highest point) My gutinstinct tells me the third is correct but i dont know how tojustify it
I thought it was at no point inparticular, but that was incorrect. My other choices are at thenbottom of circle, at the top of circle. or when the stone is levelwith my hand (halfway between lowest and highest point) My gutinstinct tells me the third is correct but i dont know how tojustify it

Explanation / Answer

Centrifugal force causes net force to be maximum atbottom, since the weight and centrifugal force add up at bottom insame direction.

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