You are Here: Home >< Maths

# AQA Mechanics 2 Unofficial Mark Scheme

Announcements Posted on
Last day to win £100 of Amazon vouchers - don't miss out! Take our quick survey to enter 24-10-2016
1. Does anybody happen to remember their other answers for question five? I struggled with the last question a lot so I'm banking on the marks from question five to keep my grade up! Thanks a lot
2. Has anyone got a copy of the paper or the last question I can have a look at?
3. (Original post by A Slice of Pi)
Has anyone got a copy of the paper or the last question I can have a look at?
There was a relatively difficult question before the last one that I remember.

A ladder of weight W lies against a rough vertical wall and a rough horizontal floor at an angle theta to the horizontal. The co-efficient of friction at the floor is 2mu and the co-efficient of friction at the wall is mu.

Draw a diagram displaying the all the forces acting on the ladder. [2 marks]

Find tan(theta) in terms of mu. [7 marks]
4. (Original post by A Slice of Pi)
Has anyone got a copy of the paper or the last question I can have a look at?
The one that you'll be helping us the most on is this one though:

A ball attached to a string in a vertical plane is projected with velocity u at the bottom of the circle. The radius of the circle is l, express u in terms of l and g needed for complete revolutions to take place. [4 marks]

It's very similar to Q8a on June 2011 but involves a string attached to a ball instead of a bead on a wire. I put my answer as u > 2root(gl) as many others have which is identical to the answer in the aforementioned past paper, however others are saying that the answer is u > root(5gl) (and it looks like that might be the correct answer). This question is by far the most controversial question out of them all.
5. (Original post by TheLifelessRobot)
The one that you'll be helping us the most on is this one though:

A ball attached to a string in a vertical plane is projected with velocity u at the bottom of the circle. The radius of the circle is l, express u in terms of l and g needed for complete revolutions to take place. [4 marks]

It's very similar to Q8a on June 2011 but involves a string attached to a ball instead of a bead on a wire. I put my answer as u > 2root(gl) as many others have which is identical to the answer in the aforementioned past paper, however others are saying that the answer is u > root(5gl) (and it looks like that might be the correct answer). This question is by far the most controversial question out of them all.
Ah, I see what the confusion is. Note that the case in June 2011 was a bead threaded on a wire. There is always going to be a reaction force on the bead in this scenario, which is why you need to consider kinetic energies instead of forces. In this question, you require the tension in the string at the top to be positive for full revolutions. I agree with the answer for the ladder question as well.
Attached Images

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
your full birthday is required
1. Oops, you need to agree to our Ts&Cs to register

Updated: June 28, 2016
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:
Today on TSR

### How does exam reform affect you?

From GCSE to A level, it's all changing

Poll
Useful resources

## Make your revision easier

Can you help? Study help unanswered threadsStudy Help rules and posting guidelinesLaTex guide for writing equations on TSR

## Groups associated with this forum:

View associated groups
Study resources

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

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.