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# Mechanics 1 help Watch

1. Hi,

The file attached is the examination style paper of the edexcel mechanics 1 book. The solutions of the questions are also included in the file.

I have done every question of the edexcel mechanics 1 book but still not able to do the question 5, of the examination style paper, correctly.

The problem is that in the solution, the weight of the particle in not taken into account when resolving the forces on the particle in the upwards direction.

Can anyone please explain me why the weight of the particle is not taken into account when resolving the forces acting on particle?

Attached Images
2. example1.pdf (241.4 KB, 2748 views)
3. (Original post by raheem94)
...

One must presume that the mass is in a weightless enviroment. The only forces acting on the mass are the ones given, which means there is no weight.

Indeed you cannot take weight into account, since you don't know how the given forces would related to the weight. Is that diagram in the vertical plane, horizontal, or something else entirely? You can't tell.
4. (Original post by ghostwalker)
One must presume that the mass is in a weightless enviroment. The only forces acting on the mass are the ones given, which means there is no weight.

Indeed you cannot take weight into account, since you don't know how the given forces would related to the weight. Is that diagram in the vertical plane, horizontal, or something else entirely? You can't tell.

I asked it to someone else and he said that the weight is not taken into account because it is acting into the plane of paper.
5. (Original post by raheem94)

I asked it to someone else and he said that the weight is not taken into account because it is acting into the plane of paper.
Technically a (free body) force diagram shows all the forces acting on that body. Since weight here is not drawn in, you can assume that there is no weight.

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