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# M2 Edexcel June 2015 Paper question 4 Watch

1. Hi, I have a query with getting the force 1/3 Rb when I take moments about A

Why is it 1/3Rbcos theta*2l, I thought it will just be 1/3Rb*2l

Im not really sure how to ask this question soz if u dont understand what im asking :s
I managed to get all the other components fine

http://qualifications.pearson.com/co...e_20150609.pdf
2. (Original post by James_pa)
Hi, I have a query with getting the force 1/3 Rb when I take moments about A

Why is it 1/3Rbcos theta*2l, I thought it will just be 1/3Rb*2l

Im not really sure how to ask this question soz if u dont understand what im asking :s
I managed to get all the other components fine

http://qualifications.pearson.com/co...e_20150609.pdf
If Rb/3 is the frictional force at B, then it's line of action is vertical.

The perpendicular distance of that line of action from A, is

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