# M2 - FRI Jan 21st (Edexcel) official thread! Watch

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#21

Dumb me! I changed my answer from right to wrong. So stupid I am, question about car and trailer. Lost 5 marks

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#22

(Original post by

Dumb me! I changed my answer from right to wrong. So stupid I am, question about car and trailer. Lost 5 marks

**BCHL85**)Dumb me! I changed my answer from right to wrong. So stupid I am, question about car and trailer. Lost 5 marks

MdSalih

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#23

(Original post by

As long as your working is still there... and its still readable... the examiner will give you some marks for it.

MdSalih

**MdSalih**)As long as your working is still there... and its still readable... the examiner will give you some marks for it.

MdSalih

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#24

(Original post by

Questions I remember:

1) Statics... hinge with rod with string or whatever it was..

a) Show T = 5/6W

b) The magnitude of horizontal force... 2W/3

2)Centre of mass of the Lamina (rectangle with circle cut out)

a) Distance from left side - 10.7 cm

b) Hung from point A - angle to verticle... 25 degrees (to nearest degree)

3) The thing on inclined plane

a) Energy lost... 40.98 J -> 41.0 J (3sf)

b) coefficient of friction... bad memory

4) Given particle velocity.. and initial position vector as (-3i + 4j)

a) Find F at t = 4....... 5.01N

b) Displacement from O ... 72.4 or 78.6 or something in that region

5) Caravan being towed by car (mass: 1500kg and 1000kg respectively) (resistive force on car = 750N)

a) Show resistive force on caravan.. 1250 N

b) Guy hits breaks... 1500N as a result of breaks.. find Deceleration-- can't remember

c) The trust as a result -- can't remember

d) Work done in stopping vehicle in kJ -- can't remember

6) Two particles going towards each other

a) Show speed of second particle after collision was 1/5 * u * (9e +4)

b) range of e ... something like e > 2/3

c) Given impulse on Q = 32mu/5 (or something) find value of e... e=7/9

7) Projectile... starts at 20m above ground... projected at a speed (can't remember speed)

a) Find time to hit ground.. think i got something like 4.77 seconds

b) Horizontal distance from O to point of impact on ground.. 122m

c) Speed when the particle is at a point (B) 16m above ground... 33.2ms^-1

d) Angle the direction of motion made to horizontal at point (B).. 39.6 degrees.. (3sf)

Thats what I got

Paper wasn't that bad... easier then most past papers.

MdSalih

**MdSalih**)Questions I remember:

1) Statics... hinge with rod with string or whatever it was..

a) Show T = 5/6W

b) The magnitude of horizontal force... 2W/3

2)Centre of mass of the Lamina (rectangle with circle cut out)

a) Distance from left side - 10.7 cm

b) Hung from point A - angle to verticle... 25 degrees (to nearest degree)

3) The thing on inclined plane

a) Energy lost... 40.98 J -> 41.0 J (3sf)

b) coefficient of friction... bad memory

4) Given particle velocity.. and initial position vector as (-3i + 4j)

a) Find F at t = 4....... 5.01N

b) Displacement from O ... 72.4 or 78.6 or something in that region

5) Caravan being towed by car (mass: 1500kg and 1000kg respectively) (resistive force on car = 750N)

a) Show resistive force on caravan.. 1250 N

b) Guy hits breaks... 1500N as a result of breaks.. find Deceleration-- can't remember

c) The trust as a result -- can't remember

d) Work done in stopping vehicle in kJ -- can't remember

6) Two particles going towards each other

a) Show speed of second particle after collision was 1/5 * u * (9e +4)

b) range of e ... something like e > 2/3

c) Given impulse on Q = 32mu/5 (or something) find value of e... e=7/9

7) Projectile... starts at 20m above ground... projected at a speed (can't remember speed)

a) Find time to hit ground.. think i got something like 4.77 seconds

b) Horizontal distance from O to point of impact on ground.. 122m

c) Speed when the particle is at a point (B) 16m above ground... 33.2ms^-1

d) Angle the direction of motion made to horizontal at point (B).. 39.6 degrees.. (3sf)

Thats what I got

Paper wasn't that bad... easier then most past papers.

MdSalih

5b) a = 1.4m/s^2 (my 1st answer).

T = 850N.

W = 335kJ

6) Range: 2/3<e<1.

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#25

(Original post by

As long as your working is still there... and its still readable... the examiner (if in a good mood :P) will give you some marks for it.

MdSalih

**MdSalih**)As long as your working is still there... and its still readable... the examiner (if in a good mood :P) will give you some marks for it.

MdSalih

Oh by the way, how much mark do u reckon u will get if u got all the methods correct and all the answers wrong? would it be at least 40/75? I know that some questions dun have follow-through marks...thats bad =.=

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#26

(Original post by

Hic, but I crossed it out, Im sure they won't mark. Why could I change my mind in 1 second ?

**BCHL85**)Hic, but I crossed it out, Im sure they won't mark. Why could I change my mind in 1 second ?

But as you've crossed it out.. i doubt you'd get full marks for the question.. you'd get some method marks I would have thought.

MdSalih

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#27

(Original post by

I hope the examiner marking mine would be in a good blind mood, just mark everything correct even if it is out by a trillion...~

Oh by the way, how much mark do u reckon u will get if u got all the methods correct and all the answers wrong? would it be at least 40/75? I know that some questions dun have follow-through marks...thats bad =.=

**cktlee1**)I hope the examiner marking mine would be in a good blind mood, just mark everything correct even if it is out by a trillion...~

Oh by the way, how much mark do u reckon u will get if u got all the methods correct and all the answers wrong? would it be at least 40/75? I know that some questions dun have follow-through marks...thats bad =.=

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#28

(Original post by

They tell you to cross out with a single neat line for a reason.. so they can read anything you've crossed out to see if theres anywhere to give marks... shows that you can actually do the question, however at that point in time you decided to do something silly :P

But as you've crossed it out.. i doubt you'd get full marks for the question.. you'd get some method marks I world have thought.

MdSalih

**MdSalih**)They tell you to cross out with a single neat line for a reason.. so they can read anything you've crossed out to see if theres anywhere to give marks... shows that you can actually do the question, however at that point in time you decided to do something silly :P

But as you've crossed it out.. i doubt you'd get full marks for the question.. you'd get some method marks I world have thought.

MdSalih

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#29

**cktlee1**)

I hope the examiner marking mine would be in a good blind mood, just mark everything correct even if it is out by a trillion...~

Oh by the way, how much mark do u reckon u will get if u got all the methods correct and all the answers wrong? would it be at least 40/75? I know that some questions dun have follow-through marks...thats bad =.=

MdSalih

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can some please explain how they got 4.77 for the last question part A thnaks

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#31

(Original post by

can some please explain how they got 4.77 for the last question part A thnaks

**kevins**)can some please explain how they got 4.77 for the last question part A thnaks

When P reaches C, y = 0 -> solve the quadratic equation to get positive value of t

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#32

**kevins**)

can some please explain how they got 4.77 for the last question part A thnaks

a = -9.8

s = -20

t = ?

using: s = ut + (1/2)at

You were given sinθ .. can't rememebr it..

you sub values in and you get t = 4.77 or t = -0.8...

disregard negative t.

MdSalih

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#33

messed that one up really badly, got most of 6 rong got less then 2/3 in staeda of grater,, got a value for e greater then 1 , and think i mess ed up bbits of the trailer 1 and the last 1

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#34

(Original post by

messed that one up really badly, got most of 6 rong got less then 2/3 in staeda of grater,, got a value for e greater then 1 , and think i mess ed up bbits of the trailer 1 and the last 1

**Imaad**)messed that one up really badly, got most of 6 rong got less then 2/3 in staeda of grater,, got a value for e greater then 1 , and think i mess ed up bbits of the trailer 1 and the last 1

MdSalih

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#35

**MdSalih**)

Questions I remember:

1) Statics... hinge with rod with string or whatever it was..

a) Show T = 5/6W

b) The magnitude of horizontal force... 2W/3

2)Centre of mass of the Lamina (rectangle with circle cut out)

a) Distance from left side - 10.7 cm

b) Hung from point A - angle to verticle... 25 degrees (to nearest degree)

3) The thing on inclined plane

a) Energy lost... 40.98 J -> 41.0 J (3sf)

b) coefficient of friction... bad memory

4) Given particle velocity.. and initial position vector as (-3i + 4j)

a) Find F at t = 4....... 5.01N

b) Displacement from O ... 72.4 or 78.6 or something in that region

5) Caravan being towed by car (mass: 1500kg and 1000kg respectively) (resistive force on car = 750N)

a) Show resistive force on caravan.. 1250 N

b) Guy hits breaks... 1500N as a result of breaks.. find Deceleration-- can't remember

c) The trust as a result -- can't remember

d) Work done in stopping vehicle in kJ -- can't remember

6) Two particles going towards each other

a) Show speed of second particle after collision was 1/5 * u * (9e +4)

b) range of e ... something like e > 2/3

c) Given impulse on Q = 32mu/5 (or something) find value of e... e=7/9

7) Projectile... starts at 20m above ground... projected at a speed (can't remember speed)

a) Find time to hit ground.. think i got something like 4.77 seconds

b) Horizontal distance from O to point of impact on ground.. 122m

c) Speed when the particle is at a point (B) 16m above ground... 33.2ms^-1

d) Angle the direction of motion made to horizontal at point (B).. 39.6 degrees.. (3sf)

Thats what I got

Paper wasn't that bad... easier then most past papers.

MdSalih

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#36

(Original post by

Don't know. But I think I get about 68-70/75. Do u think it will be greater than 87%, my 1st for M2?

**BCHL85**)Don't know. But I think I get about 68-70/75. Do u think it will be greater than 87%, my 1st for M2?

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#37

1) Statics... hinge with rod with string or whatever it was..

a) Show T = 5/6W

b) The magnitude of horizontal force... 2W/3

2)Centre of mass of the Lamina (rectangle with circle cut out)

a) Distance from left side - 10.7 cm

b) Hung from point A - angle to verticle... 25 degrees (to nearest degree)

a) Show T = 5/6W

b) The magnitude of horizontal force... 2W/3

2)Centre of mass of the Lamina (rectangle with circle cut out)

a) Distance from left side - 10.7 cm

b) Hung from point A - angle to verticle... 25 degrees (to nearest degree)

3) The thing on inclined plane

a) Energy lost... 40.98 J -> 41.0 J (3sf)

b) coefficient of friction... bad memory

a) Energy lost... 40.98 J -> 41.0 J (3sf)

b) coefficient of friction... bad memory

4) Given particle velocity.. and initial position vector as (-3i + 4j)

a) Find F at t = 4....... 5.01N

b) Displacement from O ... 72.4 or 78.6 or something in that region

a) Find F at t = 4....... 5.01N

b) Displacement from O ... 72.4 or 78.6 or something in that region

5) Caravan being towed by car (mass: 1500kg and 1000kg respectively) (resistive force on car = 750N)

a) Show resistive force on caravan.. 1250 N

b) Guy hits breaks... 1500N as a result of breaks.. find Deceleration-- can't remember

c) The trust as a result -- can't remember

a) Show resistive force on caravan.. 1250 N

b) Guy hits breaks... 1500N as a result of breaks.. find Deceleration-- can't remember

c) The trust as a result -- can't remember

(c) 850N IIRC. You considered only the car and the forces acting on it while acceleration stays the same.

d) Work done in stopping vehicle in kJ -- can't remember

**brakes**in stopping the vehicle. The resistances also did some of the work. I can't remember my answer but you multiplied the KE loss by the proportion of the constant force that was the brakes.

6) Two particles going towards each other

a) Show speed of second particle after collision was 1/5 * u * (9e +4)

b) range of e ... something like e > 2/3

c) Given impulse on Q = 32mu/5 (or something) find value of e... e=7/9

a) Show speed of second particle after collision was 1/5 * u * (9e +4)

b) range of e ... something like e > 2/3

c) Given impulse on Q = 32mu/5 (or something) find value of e... e=7/9

7) Projectile... starts at 20m above ground... projected at a speed (can't remember speed)

a) Find time to hit ground.. think i got something like 4.77 seconds

b) Horizontal distance from O to point of impact on ground.. 122m

c) Speed when the particle is at a point (B) 16m above ground... 33.2ms^-1

d) Angle the direction of motion made to horizontal at point (B).. 39.6 degrees.. (3sf)

a) Find time to hit ground.. think i got something like 4.77 seconds

b) Horizontal distance from O to point of impact on ground.. 122m

c) Speed when the particle is at a point (B) 16m above ground... 33.2ms^-1

d) Angle the direction of motion made to horizontal at point (B).. 39.6 degrees.. (3sf)

Heh. I finished the paper in 40mins then asked for some spare so i could check all my answers. I did the paper twice then the invigilator made me attach my checking to the paper in case there was anything an examiner needed to clarify

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#38

I am soooooooooooooooooooo annoyed with myself...came out of the exam hall and I found out that all you had to do for 1a to find T was to 6/8 etc.....

Lost around 7 marks i think.....done B but not sure if i'll get all the 3 marks!

And for the last question i took s as +20 and got TWO +ve answers i was soo freaked out...anyways i know i did everything else correct just +20....hence i used the time to find out the rest of the answers to b and c and d i think....

Will i get ANY marks at all ?

Lost around 7 marks i think.....done B but not sure if i'll get all the 3 marks!

And for the last question i took s as +20 and got TWO +ve answers i was soo freaked out...anyways i know i did everything else correct just +20....hence i used the time to find out the rest of the answers to b and c and d i think....

Will i get ANY marks at all ?

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#39

(Original post by

I am soooooooooooooooooooo annoyed with myself...came out of the exam hall and I found out that all you had to do for 1a to find T was to 6/8 etc.....

Lost around 7 marks i think.....done B but not sure if i'll get all the 3 marks!

And for the last question i took s as +20 and got TWO +ve answers i was soo freaked out...anyways i know i did everything else correct just +20....hence i used the time to find out the rest of the answers to b and c and d i think....

Will i get ANY marks at all ?

**ThugzMansion7**)I am soooooooooooooooooooo annoyed with myself...came out of the exam hall and I found out that all you had to do for 1a to find T was to 6/8 etc.....

Lost around 7 marks i think.....done B but not sure if i'll get all the 3 marks!

And for the last question i took s as +20 and got TWO +ve answers i was soo freaked out...anyways i know i did everything else correct just +20....hence i used the time to find out the rest of the answers to b and c and d i think....

Will i get ANY marks at all ?

You'll drop the marks on a but get method marks on b. c and d were seperate as it was a different position, so you'll still get the marks if you've dont it correctly.

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#40

(Original post by

Put your mind at ease on 7.

You'll drop the marks on a but get method marks on b. c and d were seperate as it was a different position, so you'll still get the marks if you've dont it correctly.

**Gaz031**)Put your mind at ease on 7.

You'll drop the marks on a but get method marks on b. c and d were seperate as it was a different position, so you'll still get the marks if you've dont it correctly.

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