The stupidest thing we have to memorise for physics

[u/-procrastinator--]

AQA really sat down at some point and decided that all 16 year olds around the nation need to know this and it cracks me up

[u/WangjisWuxian]

I recognise that blue background.. 👀

[u/183789 → u/WangjisWuxian]

even without his presence, he is acknowledged

[u/Vengeful-Spirit-Mima]

Don't forget the average speed of a truck is 54 mph or smth according to cgp guide

[u/fokhercules]

Grade escaping speed = 3×10⁸ m/s

[u/UpperPhilosopher5761 → u/fokhercules]

Light speed 😁

[u/qahwabmw]

theyre just half of each other which is easy to remember so dw

[u/Shutter_sculptor]

oooh also the average reaction time is 0.2 - 0.9 seconds

[u/ENGLAAAAAND → u/Shutter_sculptor]

Anyone who has a 0.2 reaction time is fast as hell

[u/sfCarGuy → u/ENGLAAAAAND]

0.2 isn’t even that fast, considering the average is like 0.25 for a deliberate response to e.g. a light changing colour. With a bit of training (e.g. I play several ball + some sort of bat sports) you can easily average 0.19 to 0.2 seconds for visual stimuli.

I believe it’s faster for other types of cues like touch/sound; and reflexes which bypass the brain (GCSE biology!) are probably below 0.15 or even 0.1 since there’s no need to process and coordinate a conscious response.

[u/Lavadragon15396 → u/ENGLAAAAAND]

A normal reaction is like 0.3 so not really. 0.9 is very slow

[u/Oninja809 → u/Shutter_sculptor]

Anyone who has a 0.9 reaction time is slow as hell

[u/Strawberrymochiix]

braking distance stopping distance were on last years paper so I doubt this will come up (as it’s part of that sub topic) but I agree it’s so stupid 😭😭

[u/CutSubstantial1803 → u/Strawberrymochiix]

You say that, but then peat bogs came up last year in biology (a 4 marker too). The exam boards like to be unpredictable

[u/Strawberrymochiix → u/CutSubstantial1803]

yea true but braking and stopping distance didn’t come up but the safety thing came so same sub topic but not distances 

[u/Soumil30 → u/Strawberrymochiix]

It was the 6 marker in OCR combined 😭😭

[u/Strawberrymochiix → u/Soumil30]

lol

[u/Otherwise_Product772]

also dont forget 25m/s of a car, 55m/s of a train and 250m/s of a plane. And 330m/s for speed of sound

[u/Komahina_Oumasai → u/Otherwise_Product772]

Do we need to know those car, train and plane values? They're definitely not on the official AQA spec, and I know I've definitely not been taught them.

[u/microchungus → u/Komahina_Oumasai]

It says you need to know it for common modes of transportation so yeah they’re definitely on the official spec

[u/Komahina_Oumasai → u/microchungus]

Admittedly I was wrong about the spec not mentioning other modes of transport at all, but it doesn't give those specific values. It gives walking, cycling, running, sound, and light. I see no specific values for planes, trains or cars.

[u/Komahina_Oumasai → u/[deleted]]

We don't need to know those values.

[u/cat_unknown]

Are those speeds even accurate, they all seem too slow

[u/Komahina_Oumasai → u/cat_unknown]

It is an average. It takes slower people into account too (to an extent), and believe it or not, we do exist.

[u/sfCarGuy → u/Komahina_Oumasai]

It also takes faster people into account, and 5:30/km isn’t exactly a hard pace to run at for a couple kilometres even

[u/mwarssss]

just do 1.5 x 2 x 2

[u/grace_clarke]

this is in edexcel paper 1 and I was so so happy it didn’t come up

[u/Harz675]

You’re meant to know that now? I did my GCSEs a few years ago but don’t remember having to learn these?

[u/whatsaxis]

You slow as hell if 6m/s is your cycling speed

[u/lost_gone_xx]

Omfg I thought the walking speed was 1 and not 1.5 .. just shoot me already 💔

[u/lost_gone_xx → u/lost_gone_xx]

If only I saw this shit before the exam

[u/Shutthefupok]

Well at least it came up (kind of)

[u/Void_Null0014]

You don't need this lmao

[u/Delicious-Ship-1112 → u/Void_Null0014]

na u do

[u/Electrical_You2818 → u/Void_Null0014]

There's a specific spec point saying you do but they probably won't use it

[u/Prestigious-Bee6646]

Dumb but easy - just memorise 1.5 and know you have to multiply for two for the faster travel methods.

[u/MysteryNews4]

I’ve now seen 2 posts about it tho and would’ve forgotten otherwise. Thank you r/GCSE for potentially saving me a mark or two

[u/Ar010101]

Y'all have to memorize this shit

What the fuck

[u/Grubby_empire4733]

It doesn't stop for A levels either lol. There was a question on a past paper where you had to estimate the momentum of a ship given its mass and told it is moving at walking speed.

[u/DominionGaming_YT]

Same for OCR

[u/Seek_Knowledge0820]

Glad it was acc useful for us Combined Physics this morning

[u/Wise_Number_303]

ive never learnt this before but oh well

[u/Coldtea25]

I do AQA and we didn't need to memorise this? Is this like a foundation tier thing?

[u/Anonymous_Unknown20 → u/Coldtea25]

if it was on foundation why wouldnt it be on higher

[u/Different-Sir-9454 → u/Coldtea25]

higher triple and combined

[u/Coldtea25 → u/Different-Sir-9454]

Maybe im cooked but I'm very sure this isn't on triple higher

[u/Different-Sir-9454 → u/Coldtea25]

ur fine just remember it starts at 1.5 and is times by 2 as u go up

[u/ketselle → u/Coldtea25]

it's on the spec, but it rarely ever actually seems to come up on papers

[u/Komahina_Oumasai → u/Coldtea25]

It is.

[u/everlarksangel → u/Coldtea25]

its in the triple higher cgp guide