Object on a String: Solving for Velocity

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The discussion focuses on solving a physics problem involving an object on a string swinging from a fixed peg. Participants emphasize the importance of energy conservation, using potential energy (PE) and kinetic energy (KE) equations to determine the object's speed at various points in its swing. The initial potential energy is calculated using the height based on the string's length, while kinetic energy is derived from the total energy conservation principle. The conversation highlights the need to correctly apply these equations and understand the relationship between height and velocity. Ultimately, the key takeaway is that total energy remains constant throughout the motion, allowing for the calculation of speed at different points in the swing.
  • #31
So is PE at the top zero also?
 
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  • #32
Noooo. PE = m g h. Get some rest and rethink this, ok? It's really not that hard. It's a lot easier than force diagrams.
 
  • #33
alright, thanks for the help
 
  • #34
No problem. Just remember total energy is constant and = mgh+(1/2)*mv^2. If you know h at any point than you can compute v. Night, night.
 

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