IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => IGCSE/ GCSE => Reference Material => Topic started by: wassup on October 10, 2009, 10:18:25 am

Title: Maths help
Post by: wassup on October 10, 2009, 10:18:25 am: Can anybody provide some notes on shear and stretch?
Title: Re: Maths help
Post by: astarmathsandphysics on October 10, 2009, 12:20:51 pm: I can make some notes. Is it for a level?
Title: Re: Maths help
Post by: sweetsh on October 10, 2009, 12:32:35 pm: No IGCSE
Title: Re: Maths help
Post by: astarmathsandphysics on October 10, 2009, 12:41:58 pm: Ok. Will do.
Title: Re: Maths help
Post by: SGVaibhav on October 10, 2009, 02:58:50 pm: There were loads of these notes made in may/june, we can just copy paste here :D
Title: Re: Maths help
Post by: astarmathsandphysics on October 10, 2009, 11:48:07 pm: I wrote these note. They are under a level physics. Tell me if you want some more.

http://www.astarmathsandphysics.com/a_level_physics_notes/a_level_physics_notes_shear_deformation.html
Title: Re: Maths help
Post by: wassup on October 11, 2009, 05:04:30 pm: thank u very much for the help but these notes are not what i need. in shear and stretch, there is an invariant and how to take out the scale factor, etc. so plz help me asap as i hav my exam in this oct/nov 09 session.
Title: Re: Maths help
Post by: sh@ni_rox on October 12, 2009, 09:04:22 am: hey :)
i dont really have any notes i can give you but i can try and explain it to you...
In a Stretch: the points move at right angles to the invariant line
there are 2 basic transformation matrix for the stretch
1.) when the x-axis is the invariant line - [0 K] where k is the scale factor
[1 0]

2.) when the y-axis is the invariant line [0 1] where K is again the scale factor
[K 0]

In a Shear: the points move parallel to the invariant line
there are also 2 basic transformation matrix for the shear
1.) when the x-axis is the invariant line - [1 K]
[0 1]

2.) when the y-axis is the invariant line - [1 0]
[K 1]
Title: Re: Maths help
Post by: sh@ni_rox on October 12, 2009, 09:08:12 am: oh by the way,
*NB: the invariant line is the line about which the transformation takes place such that points on the line remain FIXED or (do not move)

the difference between a shear and a strtch is quite easy to see, as a shear will really distort the original image, a stretch will just err... stretch it? lol
anyways hope that helped! ;D
Title: Re: Maths help
Post by: astarmathsandphysics on October 12, 2009, 11:40:34 am: I have done a pnother page of notes on this and will put them up tonight
Title: Re: Maths help
Post by: wassup on October 12, 2009, 01:16:24 pm: Thanks shani, i got a lil bit of it but m w8ing fr ur notes astar.
Title: Re: Maths help
Post by: astarmathsandphysics on October 12, 2009, 02:47:03 pm: I will do maybe 6 pages of notes today, and will keep doing igcse maths and additional maths notes for a week or two.
Title: Re: Maths help
Post by: wassup on October 12, 2009, 06:35:40 pm: plz try 2 complete d notes asap. i hav my exam on 28th october.
Title: Re: Maths help
Post by: astarmathsandphysics on October 12, 2009, 06:45:36 pm: I hope to have them up within a week. Please make a list of the topics you want or I will write them as they occur to me.
Title: Re: Maths help
Post by: @d!_†oX!© on October 12, 2009, 06:49:35 pm: Quote from: sgvaibhav on October 10, 2009, 02:58:50 pm
There were loads of these notes made in may/june, we can just copy paste here :D
which ones are u talking about vaibhav...... ???
and astar...can u please try and make notes on "components of a vector"....bt remember for igcse...plsss.....it'll be a gr8 help... :) :)
and hi mihir....welcome to d forum!!!! ;D
Title: Re: Maths help
Post by: astarmathsandphysics on October 12, 2009, 07:41:18 pm: I meant I will have a complete set within a week, like I did for A level physics and gcse maths. I will put them up at the end of each day here: http://www.astarmathsandphysics.com/igcse_maths_notes_menu.html