# MS Missing some forces

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#1
Hi all,

On q3ii, I understand that we have to resolve the forces to get magnitude of the force exerted on Beam A at the wall. Link to Paper: http://pmt.physicsandmathstutor.com/...20M2%20OCR.pdf

But the MS doesn't seem to be taking account of the contact force between the rod and the wall.

Is it because the rod is 'light' so we are taking contact force as negligible?

Thanks!
0
2 years ago
#2
If you aren't given a mass of the Rod then state in your assumptions that it is massless.
0
2 years ago
#3
(Original post by ChemBoy1)
Hi all,

On q3ii, I understand that we have to resolve the forces to get magnitude of the force exerted on Beam A at the wall. Link to Paper: http://pmt.physicsandmathstutor.com/...20M2%20OCR.pdf

But the MS doesn't seem to be taking account of the contact force between the rod and the wall.

Is it because the rod is 'light' so we are taking contact force as negligible?

Thanks!
Yeh
Also try just focusing on the forces on the beam. It makes it easier to focus on the bits the question cares about
0
2 years ago
#4
(Original post by ChemBoy1)
Hi all,

On q3ii, I understand that we have to resolve the forces to get magnitude of the force exerted on Beam A at the wall. Link to Paper: http://pmt.physicsandmathstutor.com/...20M2%20OCR.pdf

But the MS doesn't seem to be taking account of the contact force between the rod and the wall.

Is it because the rod is 'light' so we are taking contact force as negligible?

Thanks!
The weight of the rod isn't relelvant to the question. You're only interested in the forces acting on the beam.

If you try and look at the beam and rod as a single item, you have a problem in that the weight of the rod is unknown. It may cancel out in some of your working - not checked - but you're at the very least making life harder for yourself.
0
#5
Thanks all!

I seem to understand it now
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