AQA AS Physics A Unit 2 25/05/12 - PHYA2

Firstly, I think (please correct me if I misread the question), the question was concerning the energy in the whole system. Secondly, why did you multiply by 0.5 when you'd already multiplied the force by 0.5 to get 7.5N?

yesss, accel was 1.24 or something along that line



The worst Q for me was 1.

I put that a
vector : speed, displacement.
scalar: time, mass

is that right?

helicopter was like 9100

The question about phase difference was about STANDING waves NOT progressive, so you had to say 180(pi radians) difference betwwen the first two, and then 2pi or 0 difference between the first and the last. They were NOT progressive. FFS.

I just said "out of phase" for both of them

yesss, accel was 1.24 or something along that line



The worst Q for me was 1.

I put that a
vector : speed, displacement.
scalar: time, mass

is that right?

helicopter was like 9100

And for the acceleration question i just used GCSE equations because it was average acceleration

Lets try again. Past paper June 2009. Question 5.a)iii)

Same question as our one.

Thats what i used too, but now im gettin a feelin im wrong cuz evri1 used SUVAT...

Usually average accelleration is jus a=v/t so surely wer right cuz it gave us the velocity they reached and in how much time, ther ws nthin 2 say acceleration ws constant...

Thats what i used too, but now im gettin a feelin im wrong cuz evri1 used SUVAT...

Usually average accelleration is jus a=v/t so surely wer right cuz it gave us the velocity they reached and in how much time, ther ws nthin 2 say acceleration ws constant...

Would saying In phase and antiphase be sufficient for the 2 marks on that question?

Thats what i used too, but now im gettin a feelin im wrong cuz evri1 used SUVAT...

Usually average accelleration is jus a=v/t so surely wer right cuz it gave us the velocity they reached and in how much time, ther ws nthin 2 say acceleration ws constant...

What did people get for the gallelao question about the ball...

why does it go from a-b-c to the same height...i put conservation of energy and grav potential energy lost on way down is gained as kintetic on the way up cause non is lost as friction cause the slope was frictionless so goes to same height

then there was one where u had to draw a graph for the ball moving...i drew a standard terminal velocity curve that curves to start and then goes straight line and i put B at the point where it starts going straight

then there was a question about how this prooves the first law of newtons theory or w.e and i put the ball continues to move at constant speed becquse there is no overall resultant force...

hope this all made sense!

What did people get for the gallelao question about the ball...

why does it go from a-b-c to the same height...i put conservation of energy and grav potential energy lost on way down is gained as kintetic on the way up cause non is lost as friction cause the slope was frictionless so goes to same height

then there was one where u had to draw a graph for the ball moving...i drew a standard terminal velocity curve that curves to start and then goes straight line and i put B at the point where it starts going straight

then there was a question about how this prooves the first law of newtons theory or w.e and i put the ball continues to move at constant speed becquse there is no overall resultant force...

hope this all made sense!

Nobody seems to be discussing the last page.

Does anyone remember how they drew the three arrows?

For the point on the transverse wave, I put an arrow going down.

For the point on the longitudinal wave, I put an arrow going to the right.

For the wavelength I just drew an arrow from one compression to another.

AQA are so stupid. It wasn't clear whether they were referring to the point itself, or that part of the spring.

what did you guys get for the extension question