Doubts about the mechanics of walking

  • #26
jbriggs444
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Why would u want to stop it ?. . We're just trying to calculate the work done by a body moving from point A thro point B. .
Because if you do not return it to its initial state of motion, you are concerned with apples but are measuring oranges.
 
  • #27
russ_watters
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Let me try to be more direct about a possible misunderstanding:
Unless it is an automatic trolley u would still be applying a force, for it to move from point A to point B. When force and displacement are both there, even in the absence of friction, work has to be done.
In the absence of friction, there is no force during constant speed motion, so no work required to move from point A to point B if you recover the work expended to accelerate.
 
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