Circular Motion Question searching for Centripetal force

AI Thread Summary
The discussion revolves around calculating the centripetal force for a 50 g weight swung in a circle with a 90 cm string at a speed of 5.9 m/s. The participant attempts to use the equation Fc = T - Fg but struggles with the correct interpretation of tension (T) and gravitational force (Fg). The calculated tension was found to be approximately 0.96 N, leading to an incorrect centripetal force of -3.9 N, which does not match the expected value of 1.9 N. The participant seeks clarification on the directions of tension and gravitational forces and how to properly add or subtract forces acting in different directions. Understanding these concepts is crucial for accurately determining centripetal force in circular motion.
claytonwideman
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Homework Statement


A 50 g weight is swung in a circle on the end of a 90 cm long string at the speed of 5.9 m/s, what is centripetal force? [1.9 N]

Homework Equations


Vc = (2πr)\T

|a| = v^2/r

Fc = T-Fg (not sure if T is force of tension or period, my teacher,incorrectly,uses it as both)

The Attempt at a Solution


Fc = T-Fg

T=2πr/v = .95845199...

Fc = T- Fg = -3.946

-3.9 ≠ 1.9 ∴ incorrect
 
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claytonwideman said:
Fc = T-Fg
What directions are T and Fg in? How do you add and subtract forces that act in different directions?
 
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