Calculating Force Needed to Move a System of Bodies at 30 ft/s

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Discussion Overview

The discussion revolves around calculating the force required to accelerate a system of bodies to a velocity of 30 ft/s after moving 20 ft from rest. Participants are exploring the relationship between work and kinetic energy in this context.

Discussion Character

  • Exploratory, Technical explanation, Homework-related

Main Points Raised

  • One participant seeks assistance in determining the force needed for a specific velocity after a certain distance.
  • Another participant suggests using the work-energy principle, stating that the work done by the unknown force equals the change in kinetic energy.
  • There is uncertainty expressed regarding the calculation of work, with one participant questioning if it equals 0.2 and seeking confirmation.
  • Participants express difficulties in viewing a diagram that may be relevant to the problem, which could affect their ability to provide assistance.

Areas of Agreement / Disagreement

The discussion remains unresolved, with no consensus on the calculation of work or the specifics of the diagram needed for further analysis.

Contextual Notes

Participants mention the need for a diagram to clarify the problem, indicating that the current discussion may be limited by missing visual information.

the_d
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My problem is to find the force needed to give the system of bodies a velocity of 30 ft/s after moving 20 ft. from rest.

Can anyone help me with this? All i have done is found EFx and EFy for the 50lb. force.
 

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Can't see the attachment though, but try to use the fact that the work done by that unknown force equals the change of kinetic energy. I hope this helps.
 
so the work equals 0.2? r u sure
 
the_d said:
so the work equals 0.2? r u sure

No, I'm not sure until I see the diagram. :smile:
 
this is thr diagram
 

Attachments

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the_d said:
this is thr diagram

I can't see it again - perhaps there's a problem with my computer, so someone other will be able to reply.
 
ok. thankx for you help thou
 
can someone help me with this problem
 

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