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Official OCR A G481 mechanics 20th May 2013

what is the answer to the big youngs modulus question? i.e. what do they ask and what would you get marks for on it? any model questions/answers?

Reply 221

rfka

Original post by Legal drugdealer

what do you guys think will come up as in most likely??

youngs modulus experiment looks likely

Reply 222

Majjie

Hope everyone does well tomorrow! :smile:

Reply 223

rfka

Original post by Kreayshawn

what is the answer to the big youngs modulus question? i.e. what do they ask and what would you get marks for on it? any model questions/answers?

Jan 2010 Q7 it came up with a long quaestion, if you look at the mark scheme you'll see what you have to put to get the marks

Reply 224

Kreayshawn

Original post by rfka

Jan 2010 Q7 it came up with a long quaestion, if you look at the mark scheme you'll see what you have to put to get the marks

thanks pal

Reply 225

loua96

Can anyone help me with question 12a)? Kinda in panic mode!! :eek:

Reply 226

RafJav

Original post by P!=NP

Anybody got Jan 2013 markscheme, can't seem to be able to locate it.

Here

G481_MS_Jan13.pdf87.7KB

Reply 227

_hail

Original post by loua96

Can anyone help me with question 12a)? Kinda in panic mode!! :eek:

You know the time, the acceleration and the final velocity (v=0 at max height). So then just use suvat to find max height :smile:

Reply 228

RafJav

Original post by loua96

Can anyone help me with question 12a)? Kinda in panic mode!! :eek:

It's a parabolic motion question; draw out a diagram and work with the vertical components.
You know, vertically, a = 9.81, at the maximum height v = 0, the time will be halved as it's only gone half the distance so t = 0.125 and as you want s, use s = vt-1/2at^2

(edited 10 years ago)

Reply 229

Baraf

8

Original post by Baraf

can someone share notes, worked questions etc on these points.

describe and explain how
1. seat belts
2. air bags
3. crumble zone

in cars reduce impact forces on the driver in accident.

and also describe how air bags work, including triggering mechanism.

guys need some serious help here, I prefer reading notes over the book, can someone post notes and also questions on this topic.

Reply 230

amarz

2

Is anyone else feeling quite relaxed about this exam?

Reply 231

MrJiggly

2

Original post by amarz

Is anyone else feeling quite relaxed about this exam?

uh no. But I'm not panicking either...although, I feel like I should be :biggrin:

Reply 232

OllieGCSEs

10

Seatbelts/airbags:

The time taken for the driver to stop is increased using both airbags and seatbelts. An increased change in time results in a decrease in acceleration (as a=(v-u)/t, but you don't really need to say this), and a decrease in acceleration results in a decrease in force due to F=ma. Also they both prevent collisons with the windscreen/steering wheel

Posted from TSR Mobile

Reply 233

amarz

2

Original post by MrJiggly

uh no. But I'm not panicking either...although, I feel like I should be :biggrin:

So true... I'm probably going to regret not panicking, but I can't care less at the moment.
What are you predicted to get?

Reply 234

Joseph-

OP

Original post by amarz

Is anyone else feeling quite relaxed about this exam?

yeah bro totally, gonna turn up hammered to the exam.

Reply 235

MrJiggly

2

Original post by amarz

So true... I'm probably going to regret not panicking, but I can't care less at the moment.
What are you predicted to get?

hoping for an A, but I'm not too bothered about Physics really. I'm a bit disillusioned by mechanics. Only thing I like (well vaguely) is quantum physics.

Reply 236

Joseph-

OP

Original post by MrJiggly

hoping for an A, but I'm not too bothered about Physics really. I'm a bit disillusioned by mechanics. Only thing I like (well vaguely) is quantum physics.

let me guess, the only thing that interests you in that topic is the parallel universe theory, right?

Reply 237

MrJiggly

2

Original post by Joseph-

let me guess, the only thing that interests you in that topic is the parallel universe theory, right?

Yup, that would be interesting but I'm talking about the As modules. Only thing about quantum physics there is photons, which is relatively more interesting than everything else we do. I want to MURDER Electricity...it's so craaaaaaaaaaap.

Reply 238

Joseph-

OP

Original post by MrJiggly

Yup, that would be interesting but I'm talking about the As modules. Only thing about quantum physics there is photons, which is relatively more interesting than everything else we do. I want to MURDER Electricity...it's so craaaaaaaaaaap.