AQA GCSE Physics Unit 2 and 3 (20th May)

The refracted ray in the glass semi-circle diagram, it refracted along the boundary (along the base of the semi circle) as the incidence angle was at critical angle. Who else did the same?

Does anyone have a copy of the p2 paper? or a mark scheme?

Does anyone have a copy of the p2 paper? or a mark scheme?

So literally I just wrote Nucleus and Protrin mass =1 and electron is 1/1840 and I said the nucleus is protons and neutrons and I said thee electrons orbit the nucleus. And I said the charges that's it. 6/6?

Complete work solution:

80/2^n = 10
2^n = 80/10 = 8
n = log 8/log 2 = 3

half life = 36/3 = 12
Q.E.D

Physics unit 2 unofficial mark scheme.

Circuits.
Line C would have the greatest resistance because it has the shallower line on the graph so it has the most resistance. (2 marks).

Drawing a resistor - Just a rectangle with dashes on both ends. (1 mark)

Drawing a voltmeter - Voltmeter must be parallel in the circuit, so connected parallel in a circle with a "V" inside. (1 mark)

Units for resistance? Ohms.(1 mark)

Charge question. Charge = 51 unit = Coulombs (2 marks)

Half life

There was 3 H.L from 80g to 10g (80 to 40 to 20 to 10) so 36/3 = 12 years, even though I messed this up in my paper oh well. (2 marks).

Speed-distance time graph.Speed = distance/time = 175/10 = 1.75m/s (2 marks)

Breaking distance

What's breaking distance?Braking distance is the distance a vehicle will travel from the point when its brakes are fully applied to when it comes to a complete halt. (1 mark)

Factor effecting braking distance (1 mark)
-Conditions of the road.-Weather conditions

Fusion and fission.

What's fission?(1 mark)

Splitting of nuclei.

What's sub atomic particle starts the reaction? (1 mark)

Neutron.

Why does repulsion force exist? (2 marks)

Repulsion force why does it exist, because the nucleus has lots of protons which repel each other and like charges have repulsion.

Where does fusion naturally occur? (1 mark)

Stars.

two advantages for fusion. (2 marks)
-Doesn't produce nuclear waste.
-Materials needed for fusion are easily extracted so cheaper costs

.6 marker question:
-Protons and neutrons found in nucleus.
-Electrons found in electron shells.
-Protons have mass of 1 and charge of +1.
-neutrons have mass of 1 and charge of 0.
-electrons have charge of -1 and mass negligible.

Rutherford and his naughty plum pudding questions.

Charge is positive. (1 mark)

Why did his version not stick? (2 marks)

Because experiments showed alpha particles refracting, reflecting and some went through so the diagram didn't prove his theory and hence why they had to change it.

Why did scientists think their results were valid? (1 mark)

Because it was repeated 100,000 times.

Momentum

What is meant by law of momentum? (1 or 2 marks?)

Total momentum before equals total momentum after collision.

Seatbelt (4 marks)

Reduces impact time so increases the time for momentum to change, therefore decreasing the total momentum force and hence the impact would be less severe.

Momentum (4 marks)

p=m*vp= 5m/s

KE and GPE

E = m * v^2 * 1/2
E = 50g * 12^2 * 0.5
E= 3600 J (2 marks)

Maximum gravitation potential energy (1 mark)

3600 J or your answer to part (a) despite it being wrong.

Maximum height (3 marks)

E = m * g * h
3600 = 0.05 * 10 * h
3600 = 0.5 * h
3600/0.5 = 7200m

Tick the graph (1 mark)

Graph B.

Trend of graph (2 marks)

Angle 45 and less the range increases. But > 45 the range decreases.

you are wrong on the ke gpe and maximum height questions
mass is measured in kg not g
oh no you've lost 7marks

hmm I think I did quite good in the 6 markers for c2+3 (Cant say the same for biology), but I found the 1/2 markers harder in chem? wbu?

you cant even lift a finger with 3 joules

Ok, so apparently in the P3 paper there was a question where you had to draw a Ray diagram. Like an idiot I didn't see it so I must have missed that whole page. Does anyone know how many marks I missed out on because of that page?

Same here, did you draw the ray going left or right? I did it going left... D:

I did further additional and it wasn't in there, it must have been in the triple science physics paper

umm i think it was 3 marks dw that was a really difficult diagram so i hopei got it :l

Isn't it meant to be 1.25?