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I have started with AS level physics this school year and our teacher has set us some prep over half term and there is one question on there that I do not understand.

I have attached the question to this post.

The problem with this question is that it is the first question he ever set us where forces are not acting up or down.

I kow from GCSE that moment = Force * perpendicular distance

Now the problem for me with the question is the force that acts on the disk horizontaly since the perpendicular distance is not given. I have considered using trigonometry to get the perpendicular distance but for some reason i get really weird answers.

I hope some one here can help me with this question.

Thanks in advance Ancient.

Edit:

I forgot to show the direction of the vertical force on my drawing it is upwards

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# Homework Help: Fiding resultant moment about a given point?

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