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# M2 moments watch

1. http://filestore.aqa.org.uk/subjects...B-QP-JUN14.PDF

Question 7.

I'm resolving forces vertically, but the mark scheme says the angle at C is 30 degrees rather than 60, why is this? is it to due with alternating angles or something? is this to be the same through all these types of questions? (the vertical reaction force is at an angle 90 - base angle)?
2. (Original post by Bobjim12)
http://filestore.aqa.org.uk/subjects...B-QP-JUN14.PDF

Question 7.

I'm resolving forces vertically, but the mark scheme says the angle at C is 30 degrees rather than 60, why is this? is it to due with alternating angles or something? is this to be the same through all these types of questions? (the vertical reaction force is at an angle 90 - base angle)?
You have to draw it out to se it properly. The angle between then the normal force at C and the horizontal is 30 degrees. Draw everything out, yes you can use alternate angles to show that the angle between the ladder and the horizontal is 60 degrees, the same as between the ladder and the horizontal.
3. This is beautiful, thankyou!

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