The Student Room Group
Uni students - Complete our survey >>
Uni students - Complete our survey >>
Uni students - Complete our survey >>

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

Scroll to see replies

So as follows....
Original post by candol
the component of weight is always down. may be positive or negative force in f=ma depending on direction of movement
Screen Shot 2016-06-06 at 14.42.33.png41.9KB
Original post by ryandaniels2015
So as follows....


Sorry oops i meant the 3g sin theta in the opposite direction
Guys for this question, why are -2U and -6MU not allowed for the speed and the impulse?

For part a I done:
(2m)(u)+(3m)(-4u)=(5m)v
I then solved for v to give me -2u but in the mark scheme it says -2u is A0 and only 2u is allowed?

For impulse I then done (for truck P):
(-2u)(2m)-(2m)(2u) to give me -6mu, but the answer is 6mu..:s-smilie:
Screen Shot 2016-06-06 at 14.47.24.png278.1KB
Original post by particlestudent
Guys for this question, why are -2U and -6MU not allowed for the speed and the impulse?

For part a I done:
(2m)(u)+(3m)(-4u)=(5m)v
I then solved for v to give me -2u but in the mark scheme it says -2u is A0 and only 2u is allowed?

For impulse I then done (for truck P):
(-2u)(2m)-(2m)(2u) to give me -6mu, but the answer is 6mu..:s-smilie:


You got it right. You just have to write down "therefore Impulse=6mu Ns". This is what our teacher said.

I'm not quite sure about part a
(edited 7 years ago)
Reply 504
Avatar for candol
candol
7
Original post by ryandaniels2015
Sorry oops i meant the 3g sin theta in the opposite direction
its always down the slope
Original post by candol
its always down the slope


Ok Thanks
Original post by particlestudent
Guys for this question, why are -2U and -6MU not allowed for the speed and the impulse?

For part a I done:
(2m)(u)+(3m)(-4u)=(5m)v
I then solved for v to give me -2u but in the mark scheme it says -2u is A0 and only 2u is allowed?

For impulse I then done (for truck P):
(-2u)(2m)-(2m)(2u) to give me -6mu, but the answer is 6mu..:s-smilie:



also speed isn't a vector quantity, so it cant have direction

"magnitude"
Original post by boredom07
You got it right. You just have to write down "therefore Impulse=6mu Ns". This is what our teacher said.

I'm not quite sure about part a


I'm not sure why it says -2u is A0 then. Maybe because it wanted speed, the negative sign was not necessary?
Original post by KloppOClock
also speed isn't a vector quantity, so it cant have direction

"magnitude"


Oh thanks, I didn't read think of that:redface:
anyone got any general last minute tips for the M1 exam?

mine would be to check if the question is asking for acceleration/decelleration or speed/velocity as ive lost a few marks from giving the wrong answer.
https://3b0a7b1bc87f5381e60f8f717510b7e3072e9617.googledrive.com/host/0B1ZiqBksUHNYcEVTUFdwYmtsb2c/June%202013%20(R)%20QP%20-%20M1%20Edexcel.pdf

Can someone help with question 7) (C) Thanks much appreciated!
Original post by particlestudent
I'm not sure why it says -2u is A0 then. Maybe because it wanted speed, the negative sign was not necessary?


Yeah, what you said is right. Speed can never be negative so you'll need to take away the negative sign.
Have some hard questions, would appreciate some help. Dont know how to do question C on here.
http://postimg.org/image/v6x6v9hcb

I also dont understand what the forces on each of the blocks on here are:
http://postimg.org/image/z0nxjphjf
The book isnt very clear on that.

Also how do you work out part c on here:
http://postimg.org/image/vjsrjckjv
Reply 513
Avatar for candol
candol
7
Original post by fpmaniac
Have some hard questions, would appreciate some help. Dont know how to do question C on here.
http://postimg.org/image/v6x6v9hcb

I also dont understand what the forces on each of the blocks on here are:
http://postimg.org/image/z0nxjphjf
The book isnt very clear on that.

Also how do you work out part c on here:
http://postimg.org/image/vjsrjckjv


you might want to check your images out
Original post by fpmaniac
Have some hard questions, would appreciate some help. Dont know how to do question C on here.
http://postimg.org/image/v6x6v9hcb

I also dont understand what the forces on each of the blocks on here are:
http://postimg.org/image/z0nxjphjf
The book isnt very clear on that.

Also how do you work out part c on here:
http://postimg.org/image/vjsrjckjv


Question Three:

Spoiler



Question Two:

Spoiler


Question One:

Spoiler

(edited 7 years ago)
Original post by candol
you might want to check your images out


the link seems to work for me doesnt it work for you

Original post by KloppOClock
can i have the answer to part a


Answer to part a) is 18N
Original post by fpmaniac
the link seems to work for me doesnt it work for you



Answer to part a) is 18N


yh turns out you didnt need it, check my last post as i edit it
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
Original post by KloppOClock
Question Three:

Spoiler


Question Two:

Spoiler

Question One:

Spoiler



-What are the forces acting on block B.
-Wouldnt the impulse exerted on the ground be 0 because mv-mu would be 0 for the ground.

Thanx
Original post by fpmaniac
-What are the forces acting on block B.
-Wouldnt the impulse exerted on the ground be 0 because mv-mu would be 0 for the ground.

Thanx


The B hits the ground at speed, so it exerts some force onto the ground otherwise it would just carry on travelling through it

Quick Reply

Related discussions

Latest

Trending

Trending

Articles for you