Edexcel AS/A2 Mathematics M1 - 8th June 2016 - Official Thread

Scale of 1 to 10 how scared is everyone for this exam (10 being a horror film in real life).

Scale of 1 to 10 how scared is everyone for this exam (10 being a horror film in real life).

thrust is basically the opposite of tension.

Imagine tension happens when you stretch a string, thrust occurs when you compress a string.

Generaly Impulse acts opposite to the particle so for example:


O----> <-Impulse-> <----O

It is a tough one, im getting 70/75 for core 3 and 4 gold exams but for some inexplicable reason i cant not make really dumb errors on mechanics papers...its infuriating.

Its definately the paper that is easiest to mess up on

So if object A and B connected via towbar which has a thrust, woukd it be like this

A--<->--B

I read an examiners report and they penalise you for answers which are 'too precise'??!?

I read an examiners report and they penalise you for answers which are 'too precise'??!?

Really!?...well thats comforting....i always use 9.81 for gravity because thats what we use for ohysics....defo could lose some points for that

In regards to your questions.



1. The question states that $u^{2}<\frac{1}{2}gl$. This inequality is here such that the particle with speed $2u$ does not collide with the pulley. Hence neither particle goes above a height $l$ from their original position.



2. Both particles must get tension at the same time as they are connected by a single string. Tension occurs will the length of the string is of definite length $2l$ with no slack. In reality there would be rebound but this does not have to be considered for the question.



3. There would be tension if, and only if both particles were in their original position.

Hints for question
Split the problem into the 3 parts:
- When both A and B are going upwards.
- When A is going upwards and B goes downwards.
- When both A and B are going downwards.

Hope this helps,
Cryptokyo

Do you think something like this could come up in the real exam?

The likelihood of this happening is slim, but what would you lot do if there was a question about pulleys where instead of it being smooth it was rough

Yes, but you have to know when that thrust would occur. For example, say if B was a car and A was a trailer, if B moving at speed then decided to brake, thrust would occur as the towbar would compress.

Question 8 from june 2015 IAL has a pully with a rough surface. Try it its easier than you think!

Question 8 from june 2015 IAL has a pully with a rough surface. Try it its easier than you think!

Question 8 from june 2015 IAL has a pully with a rough surface. Try it its easier than you think!

Do you think something like this could come up in the real exam?

Could someone help me with January 2014 IAL Q7b :/

Could someone help me with January 2014 IAL Q7b :/

a(2i-j) + b(i+3j) = (9i+13j)