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 Post subject: Mechnics slope questionPosted: Wed, 8 Aug 2012 14:14:51 UTC
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A block of mass 5kg, which may be modelled as a particle, is on a smooth slope which is at an angle of 30 degrees to the horizontal. It is held in equilibrium by a fore P Newtons which is at 20 degrees to the horizontal.

Find P.
It is the bit about 30 degrees to the horizontal I am confused about. I am used to questions where the angle given is relative to the slope. Could some help me please and give me a start with regards to the calculations.

Thanks.

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 Post subject: Re: Mechnics slope questionPosted: Wed, 8 Aug 2012 14:49:13 UTC
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Perhaps give a sketch as well please.

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 Post subject: Re: Mechnics slope questionPosted: Wed, 8 Aug 2012 16:23:52 UTC
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kasheee wrote:
A block of mass 5kg, which may be modelled as a particle, is on a smooth slope which is at an angle of 30 degrees to the horizontal. It is held in equilibrium by a fore P Newtons which is at 20 degrees to the horizontal.

Find P.
It is the bit about 30 degrees to the horizontal I am confused about. I am used to questions where the angle given is relative to the slope. Could some help me please and give me a start with regards to the calculations.

Thanks.

kasheee wrote:
Perhaps give a sketch as well please.

The question is ambiguous as to whether P is pushing down or up vertically.

Resolve horizontally and vertically,

where R is the normal reaction force.

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 Post subject: Re: Mechnics slope questionPosted: Wed, 8 Aug 2012 16:43:17 UTC
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Sorry, 20 degrees to the horizontal such that it pushes the block up the slope.I have the advantage of the diagram f the question in from of me.

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 Post subject: Re: Mechnics slope questionPosted: Thu, 9 Aug 2012 18:53:27 UTC
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kasheee wrote:
Sorry, 20 degrees to the horizontal such that it pushes the block up the slope.I have the advantage of the diagram f the question in from of me.

If you like, for future posts you can attach an image if you upload it to some site which hosts images by using our
Code:
[img][/img]
tags.

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