XtremePapers

Is deformation specifically included in the syllabus?

http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s07_qp_1.pdf
Any idea for question 20

U as well Dark Destination

It's either A or B since X is deffo tension. I'd pick B since Z compressing and Y would probably not keep that pole straight. B makes complete sense for the shape.

Tension = <-------> , Compression = ------><----------
Try to apply these forces. You have to keep the length of everything same.

How can u say tht their lengths be same I mean even rigid materials exhibit some sort of elasticity ?
Though u have the right answer

IDK mate, I just used General Knowledge. Haven't studied Deformations yet.

The pole is in the same place (doesn't move) so it has to be these 3 forces.

There can be miniscule stretchings,which r present in all objects,accounting for the fact they produce sound on being stretch as molecules r displaced frm their positions

Also why compression at Z or whtever

Em DOT OMAR. Physics master!

Also there is nothing like this of atleast wht we,ve studied till now

No, Further math master.

You are making a moot point.

Care to explain to me why u think there,ll be compression at Z

Miss krao yaar. How do you solve this. I have no idea how to link this to the pivot.

http://s29.postimg.org/3t9rfkiiv/Zain_1.png

It,s A isn,t it

^^ The 10 N forces cause the lever to move in an anticlockwise direction and so does the 5 N force. Their sum =
(10 * 2) + (5 * 2) = 30

The 15 N force causes the lever to move in a clockwise direction. Sum = (15 * 3) = 45

Resultant = 45 - 30 = 15 N m

I understood that. How do you know that 3m and 2m is the perpendicular distance for the vertical forces? Their pivot P is above.

Just extend the lines of those forces and frm a particular pt find the perp distance ...For the 10 N for instance Extend the tht 10 N line though we do have the initial idea tht it,s horizontal and hence perp distance(by extending tht horizontal force line) wud be 2 ..Same case for 5 where u extend tht 5N line and can easily see wht the perp distance wud be

I'm an idiot. Thanks for that M dot Omar.