Mechanics Help - Statics, friction and slopes.

Hey guys, got a rather frustrating question that I've been trying to do all day but with no luck.

Here is a link to the questions.
http://i.imgur.com/CjTzAsK.jpg

I am able to do a and b.

I think c) is F = W Sin30 - 50

I think d) is N = W Cos30 = 86.6

Although if I have gone wrong here then it would explain it.

The last 2 questions I am not able to do. I have asked Reddit but so far no one has given me a step by step guide on how to calculate the weight of the crate, with the 2 unknowns N and W.

Can someone please help me out? Thanks

Reply 1

ghostwalker

Original post by skater9000

I am able to do a and b.

You have the answers to a and b, the wrong way around.

I think c) is F = W Sin30 - 50

Yes, though you can simplify that to F=0.5W - 50

I think d) is N = W Cos30 = 86.6

I sure you meant N = W cos 30 + 86.6

The last 2 questions I am not able to do. I have asked Reddit but so far no one has given me a step by step guide on how to calculate the weight of the crate, with the 2 unknowns N and W.

Can someone please help me out? Thanks

You need to use the relationship between F and N that involves the coefficient of friction.

F=\mu N

And that will allow you to eliminate N, to get an equation just involving W.

Quick Reply

Latest

Articles for you

How to revise for A-level Maths exams: AQA explains what to do

Writing a physics personal statement: expert advice from universities

What is an LLM and how could it benefit your career?

Powerful questions business students forget to ask their career advisers

Mechanics Help - Statics, friction and slopes.

Quick Reply

Related discussions

Latest

Trending

Trending

Articles for you