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# Smiley Face :) (Offline)

## Exalted Member

Last Activity 24-03-2013

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1. Mr M
01-06-2012
yes
2. Mr M
31-05-2012
Yes but it will be about 6 p.m. when I post it as I have a meeting after school and I'm teaching all day.
3. Mr M
15-05-2012
Haven't got time to help right now but if you don't know about things like contact forces you should read my OCR M1 powerpoints - I will send them if you give an email address.
4. raheem94
14-05-2012
It will be best that you post it on the forum.

I have never done a question of that type, so i can't help you on it.
5. raheem94
14-05-2012
Which part are you stuck on?
6. raheem94
14-05-2012
I haven't given much attention to your working, though i will try to explain it.

Now the lower particle(3N) will exert a vertical normal reaction on the upper particle(9N).

The diagram will look like this:

Now resolve the forces,

NB: I forgot to show friction on the diagram.

Does it makes sense?
7. raheem94
12-05-2012
Sorry for the late response.

We know , sub this in

So we get,

As , hence the coordinates are

8. raheem94
12-05-2012
When tangent is parallel to the x-axis then its gradient is zero.
9. raheem94
12-05-2012
Can a denominator be equal to zero?
Denominator being equal to zero mean , is this possilbe?

Give me the exact question.
10. raheem94
12-05-2012

Sub in x=-10 and y=7, you will get,

Now find the one root by inspection, we can see that p=-1, is a root of the expression. Hence ((p+1) is a factor of the expression, . So to find the other factors divide, by (p+1) using long division.

So in this way you will find the other 2 roots.

So now sub them in to find the possible coordinates.

• ### About Smiley Face :)

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• Last Activity 24-03-2013
• Join Date 28-10-2011

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Join Date 28-10-2011

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