Edexcel M2/M3 June 6th/10th 2013

Reply 420

LShirley95

Original post by Anonymous1717

Anyone?

Assuming this is all acting in one line Speed = |Velocity|. i.e. just take out the negative sign if it's there.

Reply 421

Zaphod77

1

Original post by Anonymous1717

Anyone?

Velocity is speed with direction. If it says find the velocity, you can leave the answer in vector form. If it asks for the speed, you always need to find the magnitude of the vector, which is where you use Pythagoras.

Reply 422

MathsNerd1

17

I'm ready to ace this exam tomorrow, bring it on!!! :biggrin:

Reply 423

benyp7

Original post by Anonymous1717

Anyone?

If velocity is negative, write the modulus of it to get the speed. If the velocity is positive you can just write that as the speed.
Speed is always positive, it is a scalar.
Velocity is a vector quantity, it has direction, so can be negative.

Reply 424

Serpentine111

12

Anyone think that collisions requiring use of sum to infinity formula will come up?

Reply 425

benyp7

Original post by Serpentine111

Anyone think that collisions requiring use of sum to infinity formula will come up?

Highly doubt it, only seen one question on it in the old M2 textbook.
Unless they wanna be really mean...

Reply 426

Student8

7

Original post by Serpentine111

Anyone think that collisions requiring use of sum to infinity formula will come up?

what is that ?!

Reply 427

Anonymous1717

Original post by benyp7

If velocity is negative, write the modulus of it to get the speed. If the velocity is positive you can just write that as the speed.
Speed is always positive, it is a scalar.
Velocity is a vector quantity, it has direction, so can be negative.

Now maybe I'm just being really stupid, but would you know it's negative if the - was in front?
And if you take the modulus of something, do you basically just put a bracket round it with a -?
Thanks so much

(edited 10 years ago)

Reply 428

benyp7

Original post by Anonymous1717

Now maybe I'm just being really stupid, but would you know it's negative if the - was in front?

Thanks so much

Well its negative if its going in the opposite direction the the positive direction. If it has a minus sign in front of it, of course it's negative.

Reply 429

MasterYi

Original post by Student8

what is that ?!

There is a question in one of the M2 textbooks where you had to to calculate things to do with a ball being dropped from a height and it would rebound up and down and up etc.

Which in theory would be infinite so you needed to combine the sum to infinity equation from C2 with the M2 stuff.

I don't think it will come up though; it was probably just a stretch and challenge thing in the text book.

Reply 430

MLogan

I'm really worried about this exam, I just hope they dont throw in any random questions that will put me off! My university place depends on this :frown:

Reply 431

MLogan

Original post by MasterYi

There is a question in one of the M2 textbooks where you had to to calculate things to do with a ball being dropped from a height and it would rebound up and down and up etc.

Which in theory would be infinite so you needed to combine the sum to infinity equation from C2 with the M2 stuff.

I don't think it will come up though; it was probably just a stretch and challenge thing in the text book.

Would you be able to tell me which question in specific so I just might try or even see the solutions! Dont want to take a chance knowing edexcel!!

Reply 432

Anonymous1717

Original post by benyp7

Well its negative if its going in the opposite direction the the positive direction. If it has a minus sign in front of it, of course it's negative.

Yeah, thanks for spelling it out for me!

Reply 433

benyp7

Original post by MLogan

I'm really worried about this exam, I just hope they dont throw in any random questions that will put me off! My university place depends on this :frown:

I need a high A-A* realistically to get into Bath! Generally it will be okay i think! It's the time handling and silly mistakes like forgetting g etc.. They bring me down so much!