M2 seriously struggling with work and energy

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will'o'wisp
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http://pmt.physicsandmathstutor.com/...%20Edexcel.pdf

Ok so i can't even do question 1

I don't get how to do this.

So i can individually work out work done or KE or GPE by itself but i can't link them together and make a link.

Is there even a formulae for it?
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Zacken
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(Original post by will'o'wisp)
http://pmt.physicsandmathstutor.com/...%20Edexcel.pdf

Ok so i can't even do question 1

I don't get how to do this.

So i can individually work out work done or KE or GPE by itself but i can't link them together and make a link.

Is there even a formulae for it?
My mechanics is a bit rusty but from what I remember, the work-energy principle says that the work done is the change in kinetic energy of the object.

So you equate the work done with the loss in kinetic energy and this gives you an equation in R.
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will'o'wisp
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(Original post by Zacken)
My mechanics is a bit rusty but from what I remember, the work-energy principle says that the work done is the change in kinetic energy of the object.

So you equate the work done with the loss in kinetic energy and this gives you an equation in R.
I see, so what about this mechanical energy stuff? i never understood it and the teacher explained it horribly :/

Thanks.
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Zacken
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(Original post by will'o'wisp)
I see, so what about this mechanical energy stuff? i never understood it and the teacher explained it horribly :/

Thanks.
If you're having trouble understanding this sort of stuff, I suggest you go through all the videos in the "Work, Energy and Power" (towards the bottom of the page) section of this: http://www.examsolutions.net/a-level.../m2-tutorials/ - it's got some excellent explanations.

Let me know how you find it.
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will'o'wisp
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(Original post by Zacken)
If you're having trouble understanding this sort of stuff, I suggest you go through all the videos in the "Work, Energy and Power" (towards the bottom of the page) section of this: http://www.examsolutions.net/a-level.../m2-tutorials/ - it's got some excellent explanations.

Let me know how you find it.
so it's literally GPE lost=KE gained?


don't know what it is but i don't really understand that work energy principle bit in that video
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Zacken
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(Original post by will'o'wisp)
so it's literally GPE lost=KE gained?


don't know what it is but i don't really understand that work energy principle bit in that video
It's literally work done = KE changed.

The specific case in the video you're talking about is where work done is the work done by the force of gravity, so "work done" is the specified to mean "GPE".

But in the most general setting, the principle is simply work done = KE changed
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will'o'wisp
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(Original post by Zacken)
It's literally work done = KE changed.

The specific case in the video you're talking about is where work done is the work done by the force of gravity, so "work done" is the specified to mean "GPE".

But in the most general setting, the principle is simply work done = KE changed
oh right i see.

Thanks i'll make another thread then if i ever get stuck....
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