What Forces Affect the Speed of a Ball in Circular Motion?

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The discussion centers on calculating the speed of a 500 g ball swinging in a vertical circle with a 1.5 m string, where the tension at the bottom is 15 N. Participants emphasize the importance of drawing a free body diagram (FBD) to analyze the forces acting on the ball, including tension and gravitational force. The tension provides the necessary centripetal force for circular motion, while the gravitational force acts downward. Understanding pseudo-forces in circular motion, such as those felt on amusement park rides, is also highlighted as relevant to the problem. The conversation encourages a systematic approach to solving for the ball's speed using the known forces.
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A 500 g ball swings in a vertical circle at the end of a 1.5-m-long string. When the ball is at the bottom of the circle, the tension in the string is 15 N.



What is the speed of the ball at that point?
 
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what have you done so far? did you draw a fbd with the ball at the bottom of the circle? Did you sum the forces acting on the ball at that point? I'd say start there and see if you get an answer.

Good luck.
 
yea i have done the FDB but I am totally lost on the equations for the problem, i don't know how to find the speed with the "knowns" that i have been given.
 
Well, you have 15N acting toward the center of the circular path and 4.905N acting down. Do you know of any pseudo-forces associated with circular motion? Do you know what force keeps a person stuck to the walls of one of those spinning amusement park rides, or the force you feel when a car goes around a corner?
 

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