You are Here: Home >< Maths

# M1 moments question watch

1. hi, for part b) of this question I got it wrong and would like some help pls. I have checked the mark scheme and realised that the position of D is actually closer to b then a. How do you know where d would be as whenever I am asked to find distance like this I always assume the pivot is very close to a... Thanks.Attachment 517721517725
Attached Images

2. (Original post by coconut64)
hi, for part b) of this question I got it wrong and would like some help pls.
How does it matter? Place it anywhere you like and call the distance - the algebra will sort itself out. You don't need to know whether d will be closer to whatever.

You should take moments from A or B instead of the centre.
3. (Original post by Zacken)
How does it matter? Place it anywhere you like and call the distance - the algebra will sort itself out. You don't need to know whether d will be closer to whatever.

You should take moments from A or B instead of the centre.
Got the right answer now thanks. I realised I used 6.5g not 6.5N .
4. (Original post by coconut64)
hi, for part b) of this question I got it wrong and would like some help pls. I have checked the mark scheme and realised that the position of D is actually closer to b then a. How do you know where d would be as whenever I am asked to find distance like this I always assume the pivot is very close to a... Thanks.Attachment 517721517725
You should have taken moments about A or B instead.

Then you don't have to worry if the moment from the reaction of the pivot will be clockwise or anticlockwise. The algebra should work itself out anyway as Zacken has said.

You should have noticed a problem when you assumed x was less than 50 but your answer was more than 50.
5. (Original post by coconut64)
Got the right answer now thanks. I realised I used 6.5g not 6.5N .
No problem!

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: April 1, 2016
Today on TSR

### Three reasons you may feel demotivated right now

...and how to stay positive

### Can I get A*s if I start revising now?

Discussions on TSR

• Latest
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
Discussions on TSR

• Latest

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