How do you calculate the energy required via torque when....

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    Energy Torque
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Discussion Overview

The discussion revolves around calculating the energy required via torque in a system involving a lever arm and a load attached to a hinge. Participants explore the implications of varying angles between the lever arm and the load during rotation, particularly focusing on the use of integrals in energy calculations.

Discussion Character

  • Technical explanation
  • Mathematical reasoning

Main Points Raised

  • One participant questions whether the formula Energy = ∫τ dφ is applicable when the angle between the lever arm and the load is changing.
  • Another participant suggests that if the angle θ is not constant, the integral ∫τ·dφ can still be used, with τ expressed as Frsinθ, where F and θ depend on φ.
  • A participant clarifies that "load" refers to the force in the context of the discussion and expresses understanding of the integral concept.
  • Another participant offers a suggestion for using online math input platforms for those unfamiliar with LaTeX.

Areas of Agreement / Disagreement

The discussion contains multiple viewpoints regarding the application of the integral for energy calculations, indicating that there is no consensus on the best approach when the angle is changing.

Contextual Notes

Participants express varying levels of understanding regarding the integral and its application, highlighting potential misunderstandings about the concept of torque and energy calculations.

warfreak131
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Let's say you have a lever arm connected to a load at the end. But the load is attached to a hinge, so no matter where the lever arm is, the load is always pointing down. I know that Energy = [integral] tau d_phi, but does that only work if the angle b/w arm and load is constant?

What if the angle between the arm and the load, theta, is changing throughout the rotation, phi?
 

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If the angle θ is not constant. We can just take the integral ∫τ·dφ, τ = Frsinθ, with F and θ in terms of φ. If both F and θ are constant than we do not need an integral. I think you might have some misunderstanding about the concept of integral. Also, what do you mean by "load"?
 
The "load" is just my way of saying the force. I understand the integral, I just wasn't sure if it was as easy as dropping in the FrSin[x] into the integral, but I guess it is. Thank you.
 
Another Suggestion. If you do not know Latex, you can search for an online math input platform to enter mathematical expressions.
 

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