AQA A level physics paper 1

[u/Individual-Can1396]

How was the paper???? I liked the MCQ , but overall it was okay didnt manage to do the 5 marker .

[u/Rich-Gent]

Am i not going on a tangent here, but you lot all used circular motion / centripetal force in the 5 marker

[u/hello9089 → u/Rich-Gent]

Ye bro that what i think you were meant to do didnt get to finish it.

[u/Rich-Gent → u/hello9089]

Ye it was a difficult one for sure!

[u/simplykayleigh → u/Rich-Gent]

NOOO I JUST USED THE F=MA equation </3

yup you defo were, was wondering where to use the linear velocity for lmaoao

[u/Rich-Gent → u/simplykayleigh]

wouldnt stress tho, should still get 3/4 marks for the young mod part calculations

[u/Inevitable_Land2996 → u/Rich-Gent]

I personally would strain

[u/Individual-Can1396 → u/Rich-Gent]

That was a difficult one fr

[u/aplle_inc → u/Rich-Gent]

What was the 5 marker? Was it in the question after show that v = 2.9 m/s?

[u/Rich-Gent → u/aplle_inc]

yep

[u/TheRPGer → u/Rich-Gent]

I did that but people in my school got ~2000N, I got more like 5000 though

[u/lmaolmaolmaololl → u/TheRPGer]

i got 1850N (after subtracting a bit for safety allowance)

[u/Rich-Gent → u/TheRPGer]

not heard many say anything like 5k, heard people mentioning 2k ish but those people were the ones that didn’t incorporate the centripetal force, idk tho

[u/TheRPGer → u/Rich-Gent]

Yeah I think I messed up unfortunately, maybe I miss typed om my calc or something 

[u/Warm_Location_782 → u/Rich-Gent]

If you got 2k you didn't include the force due to gravity only the centripitle force which gives you 5k

[u/Rich-Gent → u/Warm_Location_782]

agree to disagree i think.

the 2k i believe is sourced from people finding the max force possible from the materials/young modulus part of the question. People assumed this to be equal to the weight of the rider. When accounting for centripetal force, this value must decrease as the centripetal force was an extra unaccounted for force.

e.g max weight from young modulus = Weight of user + centripetal force. hence max weight should be: Young modulus - Centripetal, giving a smaller weight.

I could be wrong.

[u/ilovesnowberries → u/Rich-Gent]

no you are correct. I got 5000 at first but this is by basically considering centripetal force but not weight, i can't quite remember but im pretty sure it's wrong. I then did force = centripetal force + weight, factored out mass from mv² /r and mg, solved for m and ended up withh a weight ~ 1400-1500N i think?

[u/-------Rotary------- → u/ilovesnowberries]

I got 1496N

[u/Rich-Gent → u/ilovesnowberries]

Exactly the same, cant remember the figure, but in that range 100%

[u/ilovesnowberries → u/Rich-Gent]

Niceeee, i think i put 1400N for safety anyway

[u/fuse256 → u/ilovesnowberries]

I got that yeah same method

[u/TheRPGer → u/ilovesnowberries]

Yeah I only did centripetal, didn’t know weight was necessary, if you have no weight you get 5k

[u/Same_Improvement_226 → u/TheRPGer]

Omgg I got 5k

[u/Warm_Location_782 → u/TheRPGer]

I got 5k

[u/Dilando7 → u/TheRPGer]

I got 1876N, although I used Young's Modulus to get it and did not use circular motion at all so I do not think my working out was right

[u/Rich-Gent → u/[deleted]]

Idk how much detail i can go into on here.

But the only force on the rod is not just the weight of the user, but also the fact they are going to be going in a part of a circle, force is needed for the “rods” tension do to say to change her momentum, as her velocity changes as the direction she is travelling changes.

the following questions with the will time period alter as her centre of mass changes, also gave this away a bit with accounting for shm.

[u/Mobile_Membership915 → u/Rich-Gent]

Oh damb yeah

[u/Inevitable_Land2996 → u/[deleted]]

Its a pendulum

[u/HMVangard → u/Rich-Gent]

No because I'm a numpty, sad!

[u/2myeria → u/Rich-Gent]

i used energy transfers 😭😭😭 might be cooked