AQA MM1B - Mechanics 1 -Tuesday 21st June 2016

My answers, no idea how many are right:

Question 1 (Momentum)

0.4m/s
15kg

Question 2 (Particles/Vectors)

P=14
Q=-17

(16i-8j)

Question 3 (Toy Car on Slope)

1.5ms^2
1.8m/s
9°

Question 4 (Airplane)

V = 12m/s
Resultant = 90.8m/s
008°

Question 5 (Connected Particles)

3.92ms^-2
2.50m/s
1.12m

Question 6 (Cleaning Device at 60°)

Tsin60+5g
T=43.8N

Question 7 (Football Projectile)

1.76s
13.6m
13.2m/s
No air resistance

Question 8 (Helicopters)

80.5m

Posted from TSR Mobile

On Q6 for the tension I got 30.0N and not 43.8N but I'm not sure if I'm right, and on the angle question on Q3 I got 5 degrees or something.

(edited 7 years ago)

Reply 81

smartsy

11

Original post by MLW12345

Magic that's what I got ended up using that data for the next questions though, probably got bearing wrong around 007deg

I did the same thing, got 007 too

Reply 82

Timotheus

1

Original post by Chickenslayer69

On Q6 for the tension I got 30.0N and not 43.8N but I'm not sure if I'm right

I got 30N as well

Reply 83

PiTheta97

2

Original post by RUNSran

I got the same answers as you apart no 8what do you think think garde boundaries will bw?

Not sure, 55 for an A?

Posted from TSR Mobile

Reply 84

RealistZ

3

Original post by gcooney4

For the modelling assumption [1] I thought it was about air resistance but even a particle would have air resistance so I wrote that the ball cannot stretch and reaches the edges of the box and can't bounce off or tip into the box it can only land exactly on the edge

Its no rotation/spin.

Reply 85

Examguy123

2

What did everyone do to find the angle of the slope in the toy car question.

I used conservation of energy to find the height then used trig to find the angle. I got the same answer as everyone else, but conservation of energy wasnt on the spec. Will i still get the marks

Reply 86

RorMur2992

1

I got 106m for the 10 marker, anyone else?

Reply 87

Kojira

1

For Q 8, I got t= 12. I subbed in and found the s of A and B, then subtracted to find the displacement of B from A, then used pythagoras. I got around 106m. Anyone else?

(edited 7 years ago)

Reply 88

AdamFlatley

1

Original post by fffffg1g1

anyone get something like 106m for q8?

Yep

Reply 89

Spyingraven

Anyone else get 119 ish for Q8?

Reply 90

matt5822

1

Original post by fffffg1g1

anyone get something like 106m for q8?

Yes

Reply 91

smartsy

11

My answers (might have misremembered some, and others are probably wrong):
1) 15 kg
2) p = 14, q = 17
3) 9 degrees
4) V = 12, bearing = 008
5) Max heigh 1.2 m (can't really remember)
6) 43.8 N
7) Velocity around 13, modelling as particle means air resistance can be ignored)
8) I got up to finding t = 5 and t = 25, but then did a load of meaningless BS and got the wrong answer around 28 lol.

Reply 92

Examguy123

2

Original post by PiTheta97

Not sure, 55 for an A?

Posted from TSR Mobile

I would personaly put the grade boundries higher but then again i did mechanics last year too so i dont really know

Reply 93

fffffg1g1

1

Original post by matt5822

Yes

my g

Reply 94

Hep123

7

Original post by Chickenslayer69

On Q6 for the tension I got 30.0N and not 43.8N but I'm not sure if I'm right, and on the angle question on Q3 I got 5 degrees or something.

exactly the same apart from P as 2 root 5 and q as 7i and 67.8 on the last question

Reply 95

smitherito

1

I got 160 for q8. At t 25 the j components were the same hence parallel then expanded using s=Ut+1/2at^2. Then square the difference

Reply 96

smartsy

11

Original post by Examguy123

What did everyone do to find the angle of the slope in the toy car question.

I used conservation of energy to find the height then used trig to find the angle. I got the same answer as everyone else, but conservation of energy wasnt on the spec. Will i still get the marks

I hope so, because I'm pretty sure at one point I differentiated velocity to find acceleration

Reply 97

PiTheta97

2

Original post by gcooney4

For the modelling assumption [1] I thought it was about air resistance but even a particle would have air resistance so I wrote that the ball cannot stretch and reaches the edges of the box and can't bounce off or tip into the box it can only land exactly on the edge