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Equations you need to know for mechanics M1 (Edexcel)

Hey!
do you know which are the equations you need to know for mechanics M1?

Here are some of them, which ones are missing? :confused:

•

v = u + at

•

s = ut + 1/2at2

•

v2 = u2 + 2as

•

s = (u + v/2)t

•

F = ma

•

Fr = UR

•

Impulse = change in momentum --> mv - mu

•

position of a particle = original position + t(velocity vector)

•

m1u1 + m2u2 = m1v1 + m2v2

•

moment = F x X

help please! :smile:

thanks!

by the way... how are you doing with the revision of M1?
i'm really struggling! i think i'm driving my teacher mad! xD

Reply 1

Hingie

1

There aren't really that many equations in M1 that you can learn and use, it's more about whether you're secure in knowing how they all fit together and relate. That said, the ones you have there are most of them... others I can think of are:

For moments:
sum of upwards forces = sum of downwards forces

For vectors
Position/velocity of vector A relative to vector B = vector A - vector B
Magnitude of a vector =

\sqrt {(\mathrm{coefficient of }i)^2 + (\mathrm{coefficient of }j)^2}

weight = mg

Reply 2

Ourkid

12

Hingie

There aren't really that many equations in M1 that you can learn and use, it's more about whether you're secure in knowing how they all fit together and relate. That said, the ones you have there are most of them... others I can think of are:

For moments:
sum of upwards forces = sum of downwards forces

For vectors
Position/velocity of vector A relative to vector B = vector A - vector B
Magnitude of a vector =

\sqrt {(\mathrm{coefficient of }i)^2 + (\mathrm{coefficient of }j)^2}

weight = mg

Isn't that B - A?

Reply 3

Hingie

1

Ourkid

Isn't that B - A?

No I don't think so. From my M1 textbook:

The position vector of D relative to C

= r_D-r_C

Reply 4

prash_s90

16

impulse can be written as Ft = mv - mu < < something to remember

Reply 5

fmathsgirly

If in doubt, resolve.

That's how I have waded my way through M1.

Oh, and if it looks wrong, it probably is!

AND remember it's the cosine of the angle when you are resolving forces.

Those are my gems for the day :biggrin:

Reply 6

Nabster_88

dreamer girl - M1 took me a while to grasp aswell but after that initial difficulty it gets okay. You need to practice as many questions as possible. They (exam papers) all tend to have the same sort of questions on anyway.

Reply 7

-G-a-v-

16

As far as I can remember from when i did M1...the main ones you need are

v = u + at
s = 1/2 (u+v)t
s = ut + 1/2 at^2
v^2 = u^2 + 2as
F = mu.R when sliding
F <or= mu.R generally
F = ma
W = mg
I = Ft = mv - mu
total momentum before impact = total momentum after impact
Moment = Force x perpendicular distance from line of action of force

Thats about it really - its more important to know how and when to apply them though, which you can only do through lots of practice.

Reply 8

Ourkid

12

Hingie

No I don't think so. From my M1 textbook:

The position vector of D relative to C

= r_D-r_C

My bad, I tend to get confused on this when I dont think about it properly.

I agree now :smile:

OP

thanks! =)

only these few equations?

Reply 11

Zannado

s = vt -1/2 at2 (can't see it mentioned anywhere above sorry if it is)

m1u1 + m2u2 = m1v1 + m2v2

Reply 12

fblade

14

Hey guys I've this file to help me and my friends remember some of the equation for all the F and R question types :P.

two cyclists are travellin in the same direction along a straight road. B is travelling at 9m/s and A is travelling at 10m/s. At the moment when they are level they see a traffic light turn red 108m ahead. A cycles for T seconds then decelerates uniformly; B cycles for 6 seconds then decelerates uniformly. A and B stop at the traffice lights at the same instant.

(a) sketch speed time graph (did that bit)
b) calculate time during which B was decelerating (???)
c) calculate the value of T (???)

Reply 14

Tyler

The (i + j) questions are the worst....Any tips??

Reply 15

Hingie

1

abzyyy

two cyclists are travellin in the same direction along a straight road. B is travelling at 9m/s and A is travelling at 10m/s. At the moment when they are level they see a traffic light turn red 108m ahead. A cycles for T seconds then decelerates uniformly; B cycles for 6 seconds then decelerates uniformly. A and B stop at the traffice lights at the same instant.

(a) sketch speed time graph (did that bit)
b) calculate time during which B was decelerating (???)
c) calculate the value of T (???)

for part b) B cycles for 6 seconds at 9m/s, so it travels 54m in this time period. This leaves 54 metres till the traffic light. Its final velocity will be 0m/s, as it stops; its initial velocity is 9m/s. So we've now got displacement, v, and u, and we want to work out t: use an appropriate equation of motion to find it.

Reply 16

polo_polar7

dus nyone no of ny more sites which will hav more questions 2 du...or wher i cn get sum more past papers!!??
PLEASE??
xxx

Reply 17

12ian34

Zannado

s = vt -1/2 at2 (can't see it mentioned anywhere above sorry if it is)

m1u1 + m2u2 = m1v1 + m2v2

Its

s = ut + \frac{1}{2}at^2

Where u = inital velocity

EDIT: Oh, you are correct, I'm sorry. I have never seen that suvat before!

Reply 18

zeeshank786

i have found the edexcel m1 paper for may 21st may 2008 online.......is this illegal?...

i had to pay for it....

Reply 19

xsehx

1

zeeshank786

i have found the edexcel m1 paper for may 21st may 2008 online.......is this illegal?...

i had to pay for it....

Yeah im guessing so!!

Equations you need to know for mechanics M1 (Edexcel)

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