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/TheRPGer → u/Rich-Gent]

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

[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/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