Year 12s: what will be the first way you research your future options? >>

Official OCR Physics A G481 24th May June 2016

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Reply 80

cookie_raider01

Original post by LukeJonno

Suffocation or Pressure seems like good answers, i put suffocation but could be either

could you say it stops the passenger suddenly, therefore large force and could cause injury?

Reply 81

sqr00t

Original post by Agent47_

I thought it went well. Did anyone get approximately 23mm for the penultimate question?

yes, rushed it but yea. i gave it to 3s.f. 23.3 (23.25 or something)

Reply 82

LukeJonno

Original post by cookie_raider01

could you say it stops the passenger suddenly, therefore large force and could cause injury?

Not sure, the area is going to slow them down, i just thought as it was a 1 marker it would be a short simple response. Im sure they will allow all of those answers

Reply 83

Daribig

What mark do u think will be an A and the 100% ums cut off ?

Reply 84

LukeJonno

Original post by Daribig

What mark do u think will be an A and the 100% ums cut off ?

57-58 depending if they take into account last years grade data to set grade boundaries or just retakes

Reply 85

cookie_raider01

A- 44/45
B- 38
C-32
D- 25/26

Full UMS around 55 or 56

Agree?

Reply 86

Magicalgeofray

I don't think suffocation would be right, I said would bounce back with a large force, anyone else get 90m for stopping distance? x is directly proportional to stopping distance squared

Reply 87

cookie_raider01

Original post by Magicalgeofray

I don't think suffocation would be right, I said would bounce back with a large force, anyone else get 90m for stopping distance? x is directly proportional to stopping distance squared

could you say that because it doesn't have holes, the pressure would be large. Therefore it will bring the passenger to a sudden stop which could cause injury?

Reply 88

Siddhart1998

Quite easy.

Some of the stuff I got that I can remember: could be incorrect

1.)Blood accelerates at 0.149
2.) Drag affected by speed and temperature and Drag was 545N
3.) Cars jumped over was 23.3333 so 23
4.) forces X and Y were equal but Not opposite so not a couple.
When the cyclist leans forward, perpendicular distances increased, moment is same so force on X decreases.
5.) stopping distance was 90m
6.) -same force caused half the extension so in parallel the value of k is twice. k=f/x
-Load masses till strip fractures, force = number of masses * 0.1 * 9.81. Measure height with micrometer. CS Area = height * width. Stress = Force/area
7.) extension was 23.3mm
Resultant force upwards means tension increased so due to x = F/k where Force constant is same the extension increases.

Thought it was much easier than last year.
Maybe 46 for A
51 for 90%
And 56 for 100%. Idk

I needed to claw back ums because I got a low b last year on this

(edited 7 years ago)

Reply 89

President J

I got the same answers as most on here. Seems GB will be high this year lool.

Reply 90

sqr00t

Airbag question:
If it did not have holes then the airbag would end up exerting a force on the driver/passenger, causing backwards force which could injure passenger.

I ended up spacing out a lot cuz there were a lot of 1 and 2 markers so i wasted my time

managed to go through the paper, panicked because of spacing out ending up skipping the easiest marks.

on the bright side, i had a high B for unit 1 last year (solid As for unit 2 and practs) and averaged out 246UMS for an A. and they take the better score anyways, even if i could up my UMS by a few points it does make getting an A or A* much easier (im a genius with g484 and g485 :P)

expecting a high score for grade boundary for A though.

Reply 91

cookie_raider01

high grade boundaries :mad:

Reply 92

Magicalgeofray

Original post by cookie_raider01

could you say that because it doesn't have holes, the pressure would be large. Therefore it will bring the passenger to a sudden stop which could cause injury?

That sounds like a good answer to me :smile:

Reply 93

ludd-sama

Damn, I didn't think of dividing 90 by 4 for the extension question, hopefully I'll only lose 1 mark for that.

Did anyone else say the extension would increase for the very last question?

Reply 94

cookie_raider01

the highest A has ever been is about 48 out of 60
Even if it is this high, A seems possible

Reply 95

cookie_raider01

Original post by Magicalgeofray

That sounds like a good answer to me :smile:

cheers

Reply 96

sqr00t

Original post by Siddhart1998

Quite easy.

Some of the stuff I got that I can remember: could be incorrect

1.)Blood accelerates at 0.149
2.) Drag affected by speed and temperature and Drag was 545N
3.) Cars jumped over was 23.3333 so 23
4.) forces X and Y were equal but Not opposite so not a couple.
When the cyclist leans forward, perpendicular distances increased, moment is same so force on X decreases.
5.) stopping distance was 90m
6.) -same force caused half the extension so in parallel the value of k is twice. k=f/x
-Load masses till strip fractures, force = number of masses * 0.1 * 9.81. Measure height with micrometer. CS Area = height * width. Stress = Force/area
7.) extension was 23.3mm
Resultant force upwards means tension increased so due to x = F/k where Force constant is same the extension doubles.

Thought it was much easier than last year.
Maybe 46 for A
51 for 90%
And 56 for 100%. Idk

I needed to claw back ums because I got a low b last year on this

very last question, you cannot arrive at the conclusion that it doubles, though you could say that the cables would extend.

Reply 97

President J

Original post by Siddhart1998

Quite easy.

Some of the stuff I got that I can remember: could be incorrect

1.)Blood accelerates at 0.149
2.) Drag affected by speed and temperature and Drag was 545N
3.) Cars jumped over was 23.3333 so 23
4.) forces X and Y were equal but Not opposite so not a couple.
When the cyclist leans forward, perpendicular distances increased, moment is same so force on X decreases.
5.) stopping distance was 90m
6.) -same force caused half the extension so in parallel the value of k is twice. k=f/x
-Load masses till strip fractures, force = number of masses * 0.1 * 9.81. Measure height with micrometer. CS Area = height * width. Stress = Force/area
7.) extension was 23.3mm
Resultant force upwards means tension increased so due to x = F/k where Force constant is same the extension doubles.

Thought it was much easier than last year.
Maybe 46 for A
51 for 90%
And 56 for 100%. Idk

I needed to claw back ums because I got a low b last year on this

Thanks but Micrometer would be used for thickness rather than height ?

Reply 98

Magicalgeofray

Original post by ludd-sama

Damn, I didn't think of dividing 90 by 4 for the extension question, hopefully I'll only lose 1 mark for that.

Did anyone else say the extension would increase for the very last question?

I did exactly the same :frown:

I got 93 mm because I stupidly multiplied all the other values by 4 and not divided the weight by 4. To be honest I wasn't sure what to do for that question so I am hoping I get 2 marks. 1 for converting m to mm and 1 for rearranging the equation??