Can someone explain this Energy Problem

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  • Thread starter Lori
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  • #1
Lori
So- I'm gonna confused with the concept of total mechanical energy that's loss due to work other. I provided an example below.

When do I apply this equation of Wother=E2-E2? I get confused cause I thought frictionless meant that energy is conserved.
Screenshot_20171110-151116.jpg
 

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  • #2
PeroK
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Would you expect a small spring to be able to fire a ten-tonne truck as high as a marble?
 
  • #3
Lori
Would you expect a small spring to be able to fire a ten-tonne truck as high as a marble?
I know that, but I want to understand it with the work energy theorem. I don't really understand it.
 
  • #4
PeroK
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I know that, but I want to understand it with the work energy theorem. I don't really understand it.
Why not calculate the height both blocks reach?
 
  • #5
Lori
Why not calculate the height both blocks reach?
Is it .5kx^2 = mgh so h= kx^2 / 2mg

So when mass increases, height decreases?

Did i get the equation right ?
 
  • #6
PeroK
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Is it .5kx^2 = mgh so h= kx^2 / 2mg

So when mass increases, height decreases?

Did i get the equation right ?
Yes, that's it.
 

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