Turn on thread page Beta
 You are Here: Home >< Maths

# Mechanics 1 - Forces at an angle (Edexcel) watch

1. Hello there again, I've got another weird question with a weird layout. If anyone can have a look and point me in the right direction, I would be very grateful!

I've attached the question & my response, which I'm stuck on.

2. (Original post by KiddingMe)
Hello there again, I've got another weird question with a weird layout. If anyone can have a look and point me in the right direction, I would be very grateful!

I've attached the question & my response, which I'm stuck on.

Hint:

Those are equilateral triangles.

Therefore, the distance from each vertex to the opposite side is

3. (Original post by KiddingMe)
Hello there again, I've got another weird question with a weird layout. If anyone can have a look and point me in the right direction, I would be very grateful!

I've attached the question & my response, which I'm stuck on.

Just looking at the moments about D, the perpendicular distance of the 60N force is , so the moment due to that force is

I don't know how you worked yours out.
4. Sorry but I can't see the latex output, only the code, as I'm on tablet/mobile app of studentroom!

But yep, I know they're equilateral, but I'm having a re-go at it. I'll keep you updated guys! : )
5. Okie, this is my second attempt! Still stuck though
Attached Images

6. Yea, I got the moment of force P from D to be -2Pa. Did you get the same?

I got perp. distance to be 2a when working out moment of P about D not a!

Confused haha

Edit: I'm taking clockwise to be negative and anticlockwise to be positive Btw! Did I make a mistake somewhere with the signs? Cry!
7. Both (50N and PN) are going clockwise direction, so I gave both a -ve sign in front. Still unsure
8. Hmm, I got (80a)root3. Could you give us a clue where I went wrong? Cheers boss!
9. Yes, my bad, but

(i) for M(D), the perp dist to P is 2a.

(ii) you haven't got the right perp. dist to the 50N force

drop a line from D (length a root 3 as I said) and work out the perp. dist of the 80N force from B using pythagoras.
10. Cool! Just to confirm, the 50N calculations I got for both M(D) and M(B) are both wrong?

Will continue to work out moment of 50N. Cheers for helpful info!

Edit: I've got (80a)root3 for one of the moments of about B. Is this right? I still got perp. Distance to be root3 as all perps from any corner of the triangle are equal because it is equilateral.

Edit 2: isn't the perp distance just the horizontal distance: a (if we're talking about the 50N force)?
11. Its cool guys, I've managed to work it out! Cheers for all the help u 2!!

But, haha I'm stuck on the 2nd part, now that we've got a value of P. Here is my response: Btw, part b image is in the first post.

Edit: i have worked it out guys after I made some mistakes (look at above Pic and see if you can realise them!)

Cheers all & good night!
12. (Original post by KiddingMe)
Its cool guys, I've managed to work it out! Cheers for all the help u 2!!

But, haha I'm stuck on the 2nd part, now that we've got a value of P. Here is my response: Btw, part b image is in the first post.

Edit: i have worked it out guys after I made some mistakes (look at above Pic and see if you can realise them!)

Cheers all & good night!
Damn, was about to tell you

Turn on thread page Beta

### Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: March 25, 2013
Today on TSR

### Edexcel C4 Maths Unofficial Markscheme

Find out how you've done here

### 1,002

students online now

Exam discussions

Poll
Useful resources

## Make your revision easier

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

Can you help? Study help unanswered threads

## Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE