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M2 seriously struggling with work and energy

http://pmt.physicsandmathstutor.com/download/Maths/A-level/M2/Papers-Edexcel/January%202002%20QP%20-%20M2%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?
Reply 1
Avatar for Zacken
Zacken
22
Original post by will'o'wisp
http://pmt.physicsandmathstutor.com/download/Maths/A-level/M2/Papers-Edexcel/January%202002%20QP%20-%20M2%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.
Reply 2
Avatar for will'o'wisp
will'o'wisp
OP
3
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.
Reply 3
Avatar for Zacken
Zacken
22
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-maths/edexcel/m2-tutorials/ - it's got some excellent explanations.

Let me know how you find it.
Reply 4
Avatar for will'o'wisp
will'o'wisp
OP
3
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-maths/edexcel/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
Reply 5
Avatar for Zacken
Zacken
22
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
Reply 6
Avatar for will'o'wisp
will'o'wisp
OP
3
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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