# Physics P2 unofficial mark scheme.

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#1
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 = 170/10 = 1.70s (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)

What's the difference between speed and velocity? (1 mark)

Velocity is speed in a given direction.

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

1500kg x 8m/s = 12,000 kg m/s (CAR 1)
900kg x 0 m/s = 0 kg m/s (CAR 2)
12,000kg m/s divided by (1500kg + 900kg) = 5 m/s

KE and GPE

E = m * v^2 * 1/2
E = 0.05 * 12^2 * 0.5
E= 3.6 J (2 marks)

Maximum gravitation potential energy (1 mark)

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

Maximum height (3 marks)

E = m * g * h
3.6 = 0.05 * 10 * h
3.6 = 0.5 * h
3.6/0.5 = 7.2m

Tick the graph (1 mark)

Graph B.

Trend of graph (2 marks)

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

Some answers could be potentially wrong and you shouldn't be disheartened if your answer doesn't come up.

Credits go to (Tue) who helped me with remembering questions and helped in the process.

Also if this thread gets rep, I'll be sure to post P3.
36
5 years ago
#2
The KE and GPE are wrong, you should convert grams into kilograms, so the answer should be 3.6J
9
5 years ago
#3
Awsome thanks. Please to post the p3 markscheme. I think I accidentally missed a whole page. Apparently there was a ray diagram question and I don't remember doing it. If anybody knows how many marks were on that page, can you let me know?
0
5 years ago
#4
BTW, if I remember correctly - the question said that it was a model of a rocket rather than a real rocket, so I doubt that it would travel 7200m
0
5 years ago
#5
You missed out one on braking distance, about if the speed of the vehicle affects it, and plus the one about what's the difference between speed and velocity
0
5 years ago
#6
(Original post by Moko15)
Awsome thanks. Please to post the p3 markscheme. I think I accidentally missed a whole page. Apparently there was a ray diagram question and I don't remember doing it. If anybody knows how many marks were on that page, can you let me know?
I think it was a diagram that was part of the question below, it was only 1 mark
0
5 years ago
#7
I think it was 3.6J anyway and 7.2m
0
5 years ago
#8
I think the answer to the height of the rocket was 7.2m, it was a model
1
5 years ago
#9
The kinetic energy question is 3.6J and 7.2m. Mass is measured in kg, so you are not meant it convert it to grams.

Also, it said it was a model rocket, so 7200m is a bit unrealistic..
1
5 years ago
#10
Thanks for the markscheme. Just wanted to point out that some of those quetions werent on the exam. Your question "why did his version not stick" wasnt a question. The one below it was. I think the question was "Why did other scientist agree with this new structure" (of an atom)
0
5 years ago
#11
Most of those answers are right
0
5 years ago
#12
Some of the qs like his version 1 where on the test, but the s=d\t one is wrong, it wasn't fully 175 it was 170 so the answer was 1.7
0
5 years ago
#13
This is really good!! Thanks. However, it only goes up to 47 marks, can you remember the other questions??
0
5 years ago
#14
there was 1 on velocity
0
5 years ago
#15
The charge question where you had to write the unit was 3 marks. 2 fir working and answer and 1 mark for the correct unit

Posted from TSR Mobile
0
5 years ago
#16
(Original post by Ravioli99)
The charge question where you had to write the unit was 3 marks. 2 fir working and answer and 1 mark for the correct unit

Posted from TSR Mobile
Coulomb
0
5 years ago
#17
(Original post by Samfurness98)
Coulomb
Yepp

Posted from TSR Mobile
0
5 years ago
#18
does anyone know what the grade boundaries are??

what is it for a b??

any is there some questions missing???

0
5 years ago
#19
(Original post by Decklan)
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)

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.

Some answers could be potentially wrong and you shouldn't be disheartened if your answer doesn't come up.

Credits go to Nilaani (Tue) who helped me with remembering questions and helped in the process.

Also if this thread gets rep, I'll be sure to post P3.
Thanks for posting!! I agree with everything except the ones on speed and joules. The speed one was 22.5m/s I think. They asked for the maximum speed. Thus you had to calculate the gradient at the steepest point of the graph. You could not include the first curvy bit. 90/4 =22.5 and so is 45/2.

The joules one I think was 3.6J. It seems like a small number but bearing in mind this is a 50g rocket we're talking about, it's not too absurd. Moreover, it gave a more suitable figure for part b- 7.2m. No conversion was needed as the mass was given in Kg which is what you need.

Ok rant over but thanks so much for everything else
0
5 years ago
#20
(Original post by Moko15)
Awsome thanks. Please to post the p3 markscheme. I think I accidentally missed a whole page. Apparently there was a ray diagram question and I don't remember doing it. If anybody knows how many marks were on that page, can you let me know?
I'm in exactly the same situation- I don't remember there being a question on a ray diagram...
0
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