The Physics AS-Level Thread

Got 35/50 in the mock ISA, but like 10 of the lost marks were for laziness, which means I got an A in spirit

What's 10 marks lost for laziness?

I swear ISAs are out of 40 in total.

OCR B: Which part of the course is everyone on?


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AQA is out of 50 (41 + automatic 9 for practical execution).

I lost one mark for a graph scale which couldn't have checked for correct plotting without effort on the part of the marker, and I couldn't be ****ed to draw the graph in a different orientation with a scale which would have been good, but have required me to mark out like 30/40 points (Obviously this won't be a thing which will be happening in the real ISA)

A few were lost because I had an answer to a question in my head which seemed stupidly simplistic, so I wrote something else down despite my first thoughts being correct, so not all was lost through laziness My chemistry teacher reminds us of an acronym he likes to use: KISS - Keep It Simple, Stupid Not unwise advice.

Oh I thought we were both on OCR!

Hahahaha lazy!

good acronym

If you don't do repeats, what if they ask you to find the percentage uncertainty in a result?

Simple suvat
A wagon at with velocity 2ms-1 arrives at an incline on which it takes 15s to decelerate and start reversing.

Find the distance travelled up the plane.
I just did s=[(u+v)/2)]t
=[(2+0)/2]x15
=15m
But i think im ignoring deceleration due to gravity

How does gravity affect its acceleration here/how to find out accn and deccn?
Thanks

Simple suvat
A wagon at with velocity 2ms-1 arrives at an incline on which it takes 15s to decelerate and start reversing.

Find the distance travelled up the plane.
I just did s=[(u+v)/2)]t
=[(2+0)/2]x15
=15m
But i think im ignoring deceleration due to gravity

How does gravity affect its acceleration here/how to find out accn and deccn?
Thanks

You don't know the incline anyway but acceleration (well deceleration) from gravity is constant (for the purpose of the question) which means suvat is applicable.

You could work out the weight component if you wanted... Using:

v^2 = u^2 + (2)(a)(s)
-2 = as

-2/15 = a

Etc

Do you have an angle for the incline?





15 is the time taken not the displacement

Oh

There's no angle though

Simple suvat
A wagon at with velocity 2ms-1 arrives at an incline on which it takes 15s to decelerate and start reversing.

Find the distance travelled up the plane.
I just did s=[(u+v)/2)]t
=[(2+0)/2]x15
=15m
But i think im ignoring deceleration due to gravity

How does gravity affect its acceleration here/how to find out accn and deccn?
Thanks

Oh

There's no angle though

How do calculate the Voltage for both in parallel? Isn't there going to be 2 Voltage readings for both resistors?

The question must have another part?

I think I may have worked it out without an angle but it's really not just a simple suvat, you ahve to use a couple of the equations and make a couple of assumptions.

Scratch that, you're right, 15m. I checked by finding a using a quadratic to get the acceleration and then put it into s=ut+0.5at^2 and got 15m. Working's spoilered if you want to look.




Nat_LPS's approach was right, there's also this way, where I found the acceleration first:

That's where I had -2/15 and substituute it back in!

Did you do the Physics ISA on resistors? Is it an IV graph or VI graph?

Anyone done the AQA ISA for refraction?