The Difference Between a Grade E and A* Answer - A Level Physics

[@andrewjustin256]

Thank you so much for this video, Sir! I myself am a GCSE or A level student from Pakistan and I'll be giving my AS level test next year! Please recommend and post more videos like so for me in addition to elucidating on the option codes, paper 1, 2, 3, 4 and 5; tips and tricks and other bibs and bobs. Here teachers are not up to the standard so I'm having this slightly a tough row to how!

[@grace_chaulagain]

Thanks for the convenient approach

[@ShaneB24642]

As someone who recently got an A in physics, I would actually have answered the question in the first way (without rounding too early and with the correct significant figures, of course) as, for me, this seems like such a simple scenario that you can just visualise in your head. Also I have been doing projectile motion questions for quite a while now so am very familiar with things like splitting into components and applying suvat equations to the correct component so I no longer feel a need to draw and label a diagram, especially for such a simple question like this. I would just proceed by listing the known suvat variables in each direction and performing the calculations using the equations from there. This is not to say that drawing and labelling a diagram is never useful as it can be helpful, especially for longer, more complex problems, but in this case, going straight to the calculations seems to be the best, most efficient way to solve this problem. I did exactly this and got the same exact answer as you in about a minute or two.

[@Qweeeeegame]

This is really nice, but usually OCR gives such tiny space for questions sometimes

[@nickdavies2193]

This is more or less the exact approach I use to teach A Level. Unfortunately I also teach my GCSE students to do it this way. As we do AQA exams, they get no credit for correct rearrangement as AQA wants to see the medieval way of rearranging the equation with the numbers substituted in. Should I teach GCSE differently?

[@PhysicsOnline]

I think you should continue to teach the way you currently do!

[@ZaidShaheed.1]

Hey Lewis, im a new yr 12 student and i recently gave class tests for mechanics unit but i failed badly. what can u suggest? Also how did u set ur calc to display like that?

[@lak1n294]

bicen maths mechanics!

[@ZaidShaheed.1]

@lak1n294 im sorry i didnt understand what u meant? Could u pls say again?

[@dasssa-s8i]

@@ZaidShaheed.1 if you do maths watch bicen maths mechanics videos

[@adriancheung]

Hello, I got a different answer to what was in the video so I'm a bit confused. I thought that if the coin was initially travelling at 41cm s-1, then it is not being dropped from rest, therefore in s=ut+1/2at^2 for the vertical suvat, u can't ignore the initial velocity. You end up with a quadratic with t=0.393 and t=-0.477 meaning you have to ignore the negative time. In the end I got about 16cm. Is it true that the vertical component of the speed is zero even if it is rolling off the desk at a certain speed?

[@grace_chaulagain]

Certainly, the velocity that’s making it ambiguous for you is only the horizontal component as initially the coin rolls horizontally throughout the table, whereas it’s motion in the vertical direction remains unhinged as the table is horizontal. That explains the reason for taking the initial velocity in the vertical direction to be zero, as at the instant the coin is airborne the only component of velocity acting on the coin is in horizontal direction but gradually the gravitational acceleration increases the coin’s velocity vertically as well, thus explaining the parabolic path. Hope that helped.

[@adriancheung]

@@grace_chaulagain yeah it did. thanks for clearing up my misconseption

[@beehappy5677]

Hi, would it be ok to leave the result for time without a unit? Also, what about decimals to use? Is it fine to add more decimals to the results than decimals I have in my initial data? Thanks!

[@alexmaynard9327]

Great video. Just out of interest, should the units for the final answer not be in cm and not m, as the units used in the question was cm?

[@PhysicsOnline]

Usually in exams, they will have the units next to the answer line and 99% of the time it is given in standard SI units.

[@Mustafa_Shahzad]

So the real difference is don't round too early and give it to an appropriate significant figures?

[@PhysicsOnline]

It more about the approach. Setting it out properly so you can logically see each step and then not taking short cuts.

[@Mustafa_Shahzad]

@@PhysicsOnline Okay, so in a higher mark question you'd be much less likely to make a mistake in a more complicated scenario

[@PhysicsOnline]

@@Mustafa_Shahzad Exactly. Rushing your answer makes it much more likely to make an error and not even realise it later on.

[@davidplanet3919]

There should be units on all quantities. Writing t = 0.43 without units is wrong. Just putting units on the final answer is wrong.

[@pencilography2025]

​@@PhysicsOnline I've got a question. Do u connect the ammeter to the positive or negative side of the battery or does it not matter?

[@mister-mystic_2933]

Can you please make a video about all of unit 4 of IAL pearson edexcel physics? i really liked and understood your videos on unit 1 and 2 of this spec and i neeeed you to make one on unit 4.

[@wenminzhang610]

Does the rotational kinetic energy need to be considered?

[@PhysicsOnline]

Not for a standard A Level response - but would be interesting to see how this affects things if you know the moment of inertia and diameter of the coin.

[@Ziajoya123]

Is it not too long for 2 marks question ? Do you mean we should approach only big mark questions or all questions this way?

[@PhysicsOnline]

Approach ALL questions like this - it’s a lot of work but takes less than 2 minutes when you’re ready for your final exams.

[@KabeerKhan-bv6zw]

Hi, I don't know if you will see this or not but I'm a new yr12 struggling with Y1 mechanincs, although I know the concepts whenever I see the questions Iam unable to apply it pls suggest me smth for it I rlly need help

[@mk-hc3pj]

can i use ur vids for international AS level cie?

[@PhysicsOnline]

Of course!