The Physics PHYA2 thread! 5th June 2013

Original post by UnknownOrigin

Six marker topic variations up to June 2012

Jan '10: Experiment to determine the Youngs Modulus of a metal wire. materials
June '10: Energy changes of a gymnast as she jumps higher in the air on a trampoline. energy changes/mechanics
Jan '11: Explain how a stationary wave is formed, and describe key features (on a diagram shown). waves
June '11: Double slit of known separation: Describe measurements to be taken to find the wavelength of the light. waves
Jan '12: Describe a procedure to determine and accurate value for the wavelength of a laser. waves
June '12: Experiment to determine the spring constant k, of a spring. materials

I haven't seen the January 2013 paper so I don't know what the topic was for that paper.

They seem to like waves questions though... which is convenient as I detest waves.

The January 13 six marker was about the formation if standing waves :smile:

Reply 83

UnknownOrigin

Original post by Jimmy20002012

The January 13 six marker was about the formation if standing waves :smile:

Ah right okay cool.

Well then its looking more likely to be a question on something other than waves.

Although that is a very hopeful statement lol

If they did decide to do waves, I don't see why they couldn't ask a question to describe an experiment and procedure to determine the refractive index of something. Although that seems a bit easy to me... idk

Reply 84

.raiden.

OP

10

Original post by UnknownOrigin

Ah right okay cool.

Well then its looking more likely to be a question on something other than waves.

Although that is a very hopeful statement lol

If they did decide to do waves, I don't see why they couldn't ask a question to describe an experiment and procedure to determine the refractive index of something. Although that seems a bit easy to me... idk

I think there is a strong possibility of materials coming up again

Reply 85

Resitting this exam, last time I did it was January 2012 :redface:

so teaching it all myself again.

Didnt like the teacher I had for waves the first time round, but from unit 4/5 I'm starting to understand them now :biggrin:

mechanics is great :')

Resitting coz I have another 29 UMS I could pick up, which would definitely help me overall.

I need 111 to get a B which I need for uni, and that's from unit 5 & 6 , so picking up another 25 would be great :smile:

Does anyone happen to have the January 2013 paper?

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Reply 86

How do you know when to use suvat equation or other equations such as v=s/t?

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Reply 87

Original post by Jimmy20002012

How do you know when to use suvat equation or other equations such as v=s/t?

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v=s/t is essentially using the suvat equation s=ut+1/2 (at^2)

You use it for horizontal motion generally, so your acceleration is zero, therefore getting rid of the 1/2 (at^2) and just having s=ut which rearranges to u=s/t

In this case it doesn't matter if you used u or v as speed is constant.

But yeah, assuming you're talking about projectiles or something, s=ut for horizontal motion, s=ut + 1/2 (at^2) for vertical

Hope that helps :smile:

Reply 88

Original post by SortYourLife

v=s/t is essentially using the suvat equation s=ut+1/2 (at^2)

You use it for horizontal motion generally, so your acceleration is zero, therefore getting rid of the 1/2 (at^2) and just having s=ut which rearranges to u=s/t

In this case it doesn't matter if you used u or v as speed is constant.

But yeah, assuming you're talking about projectiles or something, s=ut for horizontal motion, s=ut + 1/2 (at^2) for vertical

Hope that helps :smile:

Okay, thanks :smile:

There are some questions where you think you have to use suvat equations but you don't, how do you know?

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Reply 89

Original post by Jimmy20002012

Okay, thanks :smile:

There are some questions where you think you have to use suvat equations but you don't, how do you know?

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Erm, have you got any examples? :s

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Reply 90

ImageUploadedByStudent Room1369175315.928596.jpg54.9KB

Original post by SortYourLife

Erm, have you got any examples? :s

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How about 1c on the attachment, apparently using v=s/t and reaggranging it to find t doesn't work??

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Reply 91

Original post by Jimmy20002012

How about 1c on the attachment, apparently using v=s/t and reaggranging it to find t doesn't work??

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Well here the diver is falling vertically, so you have to account for the acceleration due to gravity

S=54
U=0 (starting from rest)
V= (we do know it from part b, but not really necessary, better to use values that we know are true)

A= acceleration due to gravity, 9.81
T= what we want to calculate.

S= ut + 1/2 (at^2)
54 = 1/2 * 9.81* t^2

And blah blah blah.

You don't use s= ut as there is acceleration due to gravity involved as its vertical motion.

Ill try and find an example where you'd have to use both :smile:

Reply 92

Original post by Jimmy20002012

How about 1c on the attachment, apparently using v=s/t and reaggranging it to find t doesn't work??

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Try looking at this, it has a couple of examples that they like asking in exams
http://www.s-cool.co.uk/a-level/physics/equations-of-motion/revise-it/projectile-motion-and-what-if-velocity-and-acceleratio

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Reply 93

When looking at two waves how do we know if they are in phase or out of phase and does maxima basically mean the maximum amplitude?

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Reply 94

UnknownGuy

2

Anyone finding the legacy questions harder than the current past paper ones?

Reply 95

user1-4

1

Original post by UnknownGuy

Anyone finding the legacy questions harder than the current past paper ones?

what are those questions?

Reply 96

h94k

Can anyone help me with June 2010 6A pleasee :smile:

Reply 97

Original post by h94k

Can anyone help me with June 2010 6A pleasee :smile:

What you struggling with?

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Reply 98

eilish1903

17

Chapters 7&8 :'( kmn

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Reply 99