Question about work and force

  • Thread starter zhao
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  • #1
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Is there an example where you are pushing in the negative direction (force in negative direction) and yet doing positive work?

please help me
 

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  • #2
robphy
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What is the definition of "WORK"?
 
  • #3
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If you are pushing in the negative direction, and force is in the negative direction, the work done is always positive.

Work is the dot product of force and displacement. Thus if the angle between the displacement and force is less than 90 degrees, the work will always be positive.
 
  • #4
robphy
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Please try to give the OP a chance to answer.
 
  • #5
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Sorry, your post was not up as I was typing my response.
 
  • #6
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well, work is equal to Force * Displacement

I was thinking if displacement and force are both negative, it will give a pos. work
 

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