WJEC AS Physics PH1 May 19th 2015

I cant remember. I probably screwed it up. Circuit question and q7 were the worst though!

Did you at least find mg(delta)h and 1/2mv^2 and maybe find the difference?

Did you at least find mg(delta)h and 1/2mv^2 and maybe find the difference?

I got less than 1.6A, the same, half.

Neither have I. I havent looked at anything for about 4 weeks. OOPS

I did do potential difference but didn't think to do kinetic energy. did that for the bottom question though not the big one on top. I got like 600 something newtons for the top

for the zip line thats all you had to do was mgh at the start and 1/2mv^2 at the end. then mgh-1/2mv^2 to get the energy lost. then Work=Force x distance. so the energy lost=resistive forces x distance (between the start and finish). giving you 60 something N .and then for the second part you just divided the energy lost by the time

I just didn't listen in class for PH2, so I'm paying the penalty by having to teach myself (practically) the whole course with a textbook and below-standard class notes.

Did you do energy after-energy before? or was it the other way around?

The velocity they gave you should have been a hint? You'll probably get a mark.
I'm guessing it goes: GPE (1), KE (1), Difference (work done) (1), Force (1).

No, other way around because energy is dissipated due to frictional forces DURING the travel.

I got less than 1.6A, the same, half.

At least you have notes. We have nothing but past papers

did they even give a velocity?

Can you remember what the first part of this question was by any chance, to get less than 1.6A? Think I put 'same', can't remember if the question was current in P and Q or current in P overall! Cause overall current would go down of course but would be the same in both, may have dropped another mark there -.-

Can you remember what the first part of this question was by any chance, to get less than 1.6A? Think I put 'same', can't remember if the question was current in P and Q or current in P overall! Cause overall current would go down of course but would be the same in both, may have dropped another mark there -.-

It was : the current in the circuit?
the current in Q?
the speed drift in Q?

Yeah a lot of people put the same.
But the question asked how the total current of the circuit would change. I thought that since you're adding another wire, you're putting more resistance into the circuit so the total current decreases.
Were P and Q wires anyway? And am I right in saying that adding Q would increase the circuit resistance?? I'm starting to doubt my answer now...