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# pendulum

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1. Please can someone check my working; I've made a mistake somewhere
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2. Anyone?
3. (Original post by pippabethan)
Anyone?

Edit: wow... ignore this. As below, the centripetal acts towards the centre, i.e: in the same direction as tension.
4. (Original post by pippabethan)
Why have you got mv^/r cos theta? You're resolving along the radius.
5. (Original post by ghostwalker)
Why have you got mv^/r cos theta? You're resolving along the radius.
I just did cos60 instead of sin30?
6. (Original post by pippabethan)
I just did cos60 instead of sin30?
There shouldn't be a sin or cosine term there at all. I think you've got confused The pendulum moves in a vertical circle, not a horizontal one.

The centre of the circle is the point at the top from which the pendulum is suspended.

mv^2/r is not acting horizontally.
7. Oh, okay, thank you

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