Statics of A Particle?

[luken93]

Okay, so I do physics, so the questions relating to the downhill slope forces I find ok, but the first couple of questions I just don't understand how they rearrange the direction of the forces, and I don't find the examples too user friendly?

If anyone could explain a method of rearranging questions such as the ones that I have attached, it'd be much appreciated...

[luken93]

Well that's one of the questions, but I don't get the whole "Triangle of Forces"?
Do you just simply rearrange the lines to form a triangle?

[Plan-B]

You resolve the forces by re-arranging it as a triangle in which the forces are travelling in a cycle.
Like this: http://upload.wikimedia.org/wikipedia/en/0/02/LamiProof.png , as you can see the forces are like following each other. Sorry my explanation isn't that great

However, if the forces are all travelling in an outwards direction, and you know the angles between or magnitude of forces, you can use Lami's theorem to work out the remaining forces.
http://en.wikipedia.org/wiki/Lami%27s_theorem

I dont' think Essentials cover this, but I found this formula very handy at times.

[luken93]

Which question are you referring to? Did your teacher teach you the parallelogram method or...?
But otherwise, yes...

Nope I'm bring a lone ranger doing it, the rest of the class aren't up to it and teacher doesn't want to teach me yet

You resolve the forces by re-arranging it as a triangle in which the forces are travelling in a cycle.
Like this: http://upload.wikimedia.org/wikipedia/en/0/02/LamiProof.png , as you can see the forces are like following each other. Sorry my explanation isn't that great

However, if the forces are all travelling in an outwards direction, and you know the angles between or magnitude of forces, you can use Lami's theorem to work out the remaining forces.
http://en.wikipedia.org/wiki/Lami%27s_theorem

I dont' think Essentials cover this, but I found this formula very handy at times.

Thanks heaps!