Circular Motion,Uniform motion in Vertical Circles

AI Thread Summary
In circular motion, the direction of centripetal force varies depending on the object's position in the vertical circle. At the top, the centripetal force points downward and is considered negative, while at the bottom, it points upward and is considered positive. The sign of the centripetal force is influenced by the chosen coordinate system, known as a sign convention. It's essential to maintain consistency in applying this convention throughout each problem. Understanding these principles is crucial for solving problems related to uniform motion in vertical circles.
Lydia22
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Homework Statement



If the object is at the top, the centripetal force (pointing as
always towards the centre) is down and negative.
● If the object is at the bottom, the centripetal force is pointing up and positive

The Attempt at a Solution


I thought any force towards the center is always positive.Am i wrong?
 
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Depends on your coordinate system?
 
It's called a sign convention. You may choose it to be whatever you wish but you must be consistent within each problem.
 

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