You are Here: Home

# M1 urgent help please!! Tweet

Maths and statistics discussion, revision, exam and homework help.

Announcements Posted on
TSR launches Learn Together! - Our new subscription to help improve your learning 16-05-2013
IMPORTANT: You must wait until midnight (morning exams)/4.30AM (afternoon exams) to discuss Edexcel exams and until 1pm/6pm the following day for STEP and IB exams. Please read before posting, including for rules for practical and oral exams. 28-04-2013

Hi ,
For the first part I got T = 167N - which is right
For the second part I am getting the Value of P to pe 6400 N which is wrong...
I resolved the force perpendicular (psin 30) and parallel to the plane (p cos 40)
Then I tried to solve it simultanoesly but it gave me 6400 N

HELP ME!!
2. Re: M1 urgent help please!!
Hmmmm

I'm keep getting P=497N which I feel is wrong.
3. Re: M1 urgent help please!!
(Original post by VictorDeLost)
Hmmmm

I'm keep getting P=497N which I feel is wrong.
Any idea??
4. Re: M1 urgent help please!!
(Original post by Smiley Face :))
Any idea??
5. Re: M1 urgent help please!!
(Original post by raheem94)
580N
6. Re: M1 urgent help please!!
any ideas any one??
7. Re: M1 urgent help please!!
(Original post by Smiley Face :))
any ideas any one??
8. Re: M1 urgent help please!!
Resolving parallel and perpendicular should work - I've drawn a diagram to show the equationsI used so you can perhaps see what you're missing - these equations solve to give P as 580.16... N

Attached Thumbnails

9. Re: M1 urgent help please!!
(Original post by Smiley Face :))
any ideas any one??
The least value of P occurs when friction acts up the plane. Hence,
Pcos30+0.2(175gcos30+Psin30)=175 gsin30
=> P=580.2 N as required.
10. Re: M1 urgent help please!!
(Original post by Aurum)
The least value of P occurs when friction acts up the plane. Hence,
Pcos30+0.2(175gcos30+Psin30)=175 gsin30
=> P=580.2 N as required.
Ok.. so friction acts up the plane... oh yeah... stopping it from slipping down the plane!! Just realised!!
11. Re: M1 urgent help please!!
(Original post by Aurum)
The least value of P occurs when friction acts up the plane. Hence,
Pcos30+0.2(175gcos30+Psin30)=175 gsin30
=> P=580.2 N as required.
I completely ignored the original weight of the sledge itself so my equation had the weight of the sledge with the two people on it as 150g.