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Work done sliding up frictionless inclined plane is it zero, or would it be greater

  1. Oct 18, 2007 #1
    Review time; came across that question in the text....I DON'T KNOW!

    ...i hate this class.

    :"[
     
  2. jcsd
  3. Oct 18, 2007 #2

    learningphysics

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    what is the total work done on a block sliding up a frictionless plane?

    Is the block slowing down or speeding up?

    What does the work-energy theorem say?
     
  4. Oct 18, 2007 #3
    block would be slowing down right, if it's going up?

    work-energy thm. says W= change in kinetic energy....
     
  5. Oct 18, 2007 #4

    TMM

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    It's negative, because the projection of the force of gravity on the displacement up the ramp is in the opposite direction.
     
  6. Oct 18, 2007 #5

    learningphysics

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    exactly... so since it is slowing down... change in kinetic energy is negative... so work done on the block is negative.
     
  7. Oct 18, 2007 #6
    ok. i think i get it.

    thanks guys! :]
     
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