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Isn't the normal acceleration always towards the center?

  • Thread starter cipotilla
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  • #1
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Homework Statement


Homework Equations



See attachment

The Attempt at a Solution


I solved the problem (on the same page as problem, written in pencil) but the direction of the acceleration that I calculated is different, I dont understand why my answer is wrong if the normal acceleration always towards the center and the tangent acceleration is suppossed to be clockwise.
 

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Answers and Replies

  • #2
Doc Al
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Yes, the radial acceleration is towards the center. But I don't see why you think your solution is different from the book's. Seems to me you are just measuring your angle from a different reference direction--they measure from the horizontal, you from the vertical.
 
  • #3
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Yes, the radial acceleration is towards the center. But I don't see why you think your solution is different from the book's. Seems to me you are just measuring your angle from a different reference direction--they measure from the horizontal, you from the vertical.
I think I measured from the horizontal, thats why I think my answer is different from the books, see diagram. Thanks!
 

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  • #4
Doc Al
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Looks to me like your diagram is sideways, compared to the original diagram given with the problem. What you call "horizontal" appears as vertical in the original diagram.
 
  • #5
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You are absolutely right, drew my acceleration vectors on the right side of the pulley, where there is no conveyor belt, thats why I got confused. Ok, thanks you.
 

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