AQA 2021 Paper 1 - A-level Physics Past Paper

-----------------------------------------------------

----------------------------------------------------
00:00 Q1 - Particles & specific charge
07:21 Q2 - Waves - superpositioning
13:33 Q3 - Optic fibres - refraction
17:54 Q4 - Spacecraft - circular motion & materials
26:40 Q5 - Projectile motion - rugby ball
34:07 Q6 - Log graph - potential divider
39:36 Multiple choice -
----------------------------------------------------------------------

[ScienceShorts]

Q17 - I have no idea where I got that 0.5 from - complete nonsense!

[nippynippy]

this guy is so funny he honestly makes my day

[jkim]

Thanks man for carrying my physics. No one else posts these videos apart from you. But is it me or was this paper extremely difficult than others?

[AZ-hmkn]

Q4.4 why would you use the mass of A and not the mass of A and B

[theodirisu]

very helpful reviews of the papers if i get an A* im shouting u out on the channel lol

[xeronxte]

For Q18, how are P and R in antiphase, I thought this meant that they were pi radians apart?

[jamesyung]

How did you get 300k ohm for 6.1? The value at 10^0 for me is half way 10^5 to 10^6

[franciscoovarela]

For question 4.4 I still don't really understand why we have to use the mass of A. He said if we use the mass of A and we ignore the fact that B exists, the stress would be the same. But why A? What if we ignored A and used the force of B?

[lycheeboys]

For question 4.1 if the same centripetal force that's acting on A is acting on the astronaut wouldn't they be standing on the opposite side of the box as the force would be pushing them towards O not away from it, it also makes sense for their to be a force pushing them away from O as you can think of when your turning through a roundabout you get pushed away from the roundabout not towards it

[shelaghzachariades]

Surely an anti proton experiences an EM force and a strong nuclear force so B would also be correct for qu 9. You passed over that really quickly.

[zigzagnemesist]

For question 28, Why are we adding on the resistance of 2.4? I thought it was in parallel to cells.

[AZ-hmkn]

For Q2 why would you use path difference?

[rjtj]

for question 3.2 how come the ray of light travels along the core-cladding boundary

[lilyella]

I'm confused with 5.3 what does it mean on the way up and down? is it like the time to reach the post and then the time to reach the ground??

[anty]

where did u get wavelength is 0.5 for Q 17

[secretlycreated]

In 4.4 so can you assume the mss to be m(B) rather the m(A) just using the same logic as you did. ?

[puddleduck]

22:31 for 4.3 could u have said conservation of momentum? so because mass of A is lower, it is faster to conserve momentum

[badyahelamin]

@58:28 Q27 how does the voltmeter measure the terminal pd? does the current not go through the voltmeter which has a very high resistance so v =0?

[howlinwolf]

Thanks for this. What do program do you use for this please?

[riyapatil]

How do you know that the angular speed for both A and B is the same in question 4.3?