IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Reference Material => GCE AS & A2 Level => Pastpapers => Topic started by: Sue T on December 13, 2009, 01:45:22 pm

Title: vectors- As physics
Post by: Sue T on December 13, 2009, 01:45:22 pm

does any1 have any notes for vectors? cuz they're really tricky! :o

Title: Re: vectors- As physics
Post by: nid404 on December 13, 2009, 01:53:51 pm

Vectors for AS physics are really easy....just work on sums in ur text and past papers...if u don't get any post them here, and we'll do it for u

I will look for notes on vectors anyway...try S-cool Physics...maybe that'll help

Title: Re: vectors- As physics
Post by: nid404 on December 13, 2009, 01:55:26 pm

http://id.mind.net/~zona/mstm/physics/mechanics/vectors/vectors.html

The base of vectors

Title: Re: vectors- As physics
Post by: nid404 on December 13, 2009, 01:56:45 pm

oh & if u want me to give u questions to do...I'll be glad to help and c how much you could do by yourself....lemme knw  :)

Title: Re: vectors- As physics
Post by: girl_92 on December 13, 2009, 06:00:25 pm

nid can u solve this 4 me i have an exam tommorow i wuld be relli thnkful
a student standin on a railway platform notices tth the first two carriages of an arriving train passes her in 2 sec and the nxt two in 2.4 s
the train is decelaratin uniformly.each carriage is 20m long when the train stops the student is opposite the last carriae how many carriages are there in the train

Title: Re: vectors- As physics
Post by: astarmathsandphysics on December 14, 2009, 08:30:58 am

When i get up

Title: Re: vectors- As physics
Post by: astarmathsandphysics on December 14, 2009, 10:28:49 am

Use s=ut+1/2at^2 twice

For the first two carriages
40=2u+2a
For the first for carraiges
80=4.4u+9.68a
Solve thes to get u=710/33
a=-50/33
then train takes s=(v^2-u^2)/2a=(710/33)^2/(2*50/33)=148.9
8 carrariages

Title: Re: vectors- As physics
Post by: Sue T on December 14, 2009, 02:12:21 pm

thank you so much
 i'll study from the website u gave then if u can upload the questions it'll be great cuz i do need some practice :D

Title: Re: vectors- As physics
Post by: girl_92 on December 15, 2009, 07:46:34 am

Quote from: astarmathsandphysics on December 14, 2009, 10:28:49 am

Use s=ut+1/2at^2 twice

For the first two carriages
40=2u+2a
For the first for carraiges
80=4.4u+9.68a
Solve thes to get u=710/33
a=-50/33
then train takes s=(v^2-u^2)/2a=(710/33)^2/(2*50/33)=148.9
8 carrariages

Thanks  alot sir