AQA AS Physics Unit 2 (PHYA2) June 9th 2016 Resit paper

I think I did it like this-Friction force= 1.8W= Fs1.8 x 0.2 = 0.36J2.2 (Initial energy of block when it leaves the spring) + 0.36 = 2.56 JThe follow-up question about the force thing, I just used W = Fs again. Since the energy needed to push the block away was the same as that needed to compress the spring, the energy needed to compress the spring must've been 2.56j.So...2.56 = F x 0.2F = 12.8 NAnyone else got the same answer?


P.S. The amount of silly mistakes that I have made is absolutely unreal. Like dividing by 100 rather than 1000, ticked red when I meant to tick violet, said 'so easier for angles to be smaller than critical angle when I was thinking 'larger'. Oh my world.

Yeah for the same i put magnitude of forces, and for diffferent i put direction/vectors were different

Please get a cheeky pic of every page.

I think I did it like this-
Friction force= 1.8W= Fs1.8 x 0.2 = 0.36J2.2 (Initial energy of block when it leaves the spring) + 0.36 = 2.56 J

The follow-up question about the force thing, I just used W = Fs again. Since the energy needed to push the block away was the same as that needed to compress the spring, the energy needed to compress the spring must've been 2.56j.So...2.56 = F x 0.2F = 12.8 N

Anyone else got the same answer?



P.S. The amount of silly mistakes that I have made is absolutely unreal. Like dividing by 100 rather than 1000, ticked red when I meant to tick violet, said 'so easier for angles to be smaller than critical angle when I was thinking 'larger'. Oh my world.

If not pictures, I'll make a note of numbers and stuff and recreate the questions. Just to put with the markscheme

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can someone go through the waves questions... i know everyone is saying it was easy but i can't remember what it was.
all i remember:

- define a progressive wave - a wave that travels through a medium?
- tick 2 boxes about a sound wave - that they can interfere and are longitudinal ?
- something about the amplitude and what effect increasing the frequency would do?
- can't remember what else there was?

anyone?

longitudinal is one that travels through a medium not sure if its a relevant point? i thought the point of the question was to make the distinction between progressive and standing waves? I put waves that "move" in a direction and that transfer energy (since standing waves do not) ??

same ticks as you

No idea on this one rly. Increase f meant lower wavelength so less diffraction so points A and B were closer together?

The points were fixed, you would just observe more peaks on the graph

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Good job i didnt take english lit

does anyone remember how many marks was the whole question 8 worth? plz

The points were fixed, you would just observe more peaks on the graph

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Wouldn't you say that the points would be further apart , sort of like fringe spacing as a change in frequency would change the wavelength.


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The object wasn't in equilibrium, so it didn't subject to newtons 3rd law.

Surely if they're in equilibrium or not is irrelevant? A book on table isn't experiencing Newton's third law forces but the forces have to be in equilibrium for the book not to go through the table

Paper is sitting in front of me

Questions?

The book would be obeying Newton's third law of motion as the law states that when object A (book) exerts a force (its weight) on object B(Table), object B would exert an equal and opposite force (reaction force) on object A. In this case, the system is in equilibrium.

Paper is sitting in front of me

Questions?