Review Time] Can't Answer That Question...

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Homework Help Overview

The discussion revolves around a physics problem concerning the total work done on a block sliding up a frictionless plane, specifically examining the implications of the work-energy theorem in this context.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants explore whether the block is slowing down or speeding up as it moves up the ramp and discuss the implications of the work-energy theorem, particularly in relation to changes in kinetic energy.

Discussion Status

Some participants have provided insights into the relationship between work done and kinetic energy, noting that the work done is negative if the block is slowing down. There appears to be a productive exchange of ideas, with some participants expressing understanding of the concepts discussed.

Contextual Notes

Participants express frustration with the class and the difficulty of the material, indicating a challenging learning environment. The original poster's uncertainty highlights the complexity of the topic being discussed.

pebbles
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Review time; came across that question in the text...I DON'T KNOW!

...i hate this class.

:"[
 
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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?
 
block would be slowing down right, if it's going up?

work-energy thm. says W= change in kinetic energy...
 
It's negative, because the projection of the force of gravity on the displacement up the ramp is in the opposite direction.
 
pebbles said:
block would be slowing down right, if it's going up?

work-energy thm. says W= change in kinetic energy...

exactly... so since it is slowing down... change in kinetic energy is negative... so work done on the block is negative.
 
ok. i think i get it.

thanks guys! :]
 

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