Turn on thread page Beta
 You are Here: Home >< Maths

# Vectors watch

1. CAn somebody please direct me to a site which can improve my vectors, i can fins when things intersect and equations etc, it is just when the wording gets a bit complicated it gets me
2. haven't you got a textbook? I find vectors are usually pretty well explained in them, if you just do loads of questions.

A few things to remember

AB = OB - OA (O can be any point that is common to the two)
midpoint AB = (1/2)(a+b)

if you've got a line r = a + tb
then the point P on that line such that OP is perpendicular to the line is is the point where the position vector of P is perpendicular to the direction of the line, ie (a + tb) is perpendicular to b. Dot product then = 0 and you can work out the value of t for which this is true.

Vectors represent a movement. I know this is obvious, but it made things much clearer for me when I realised that to get to the midpoint of AB, simply going halfway along AB by using 0.5(OB-OA) won't work because all vectors are given from the point O, and if you performed the movement that would take you halfway from A to B but started at O, you'd end up somewhere else. You have to actually get to A first, and then move halfway.

sorry if all this stuff is ridiculously obvious/doesn't make sense, but it helps me to know what's going on with vectors.

john

Reply
Submit reply
Turn on thread page Beta
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: June 11, 2006
Today on TSR

### Cambridge interviews

Find out who is getting invitations

### University open days

• Heriot-Watt University
School of Textiles and Design Undergraduate
Fri, 16 Nov '18
• University of Roehampton
All departments Undergraduate
Sat, 17 Nov '18
• Edge Hill University
Faculty of Health and Social Care Undergraduate
Sat, 17 Nov '18
Poll
Useful resources

## Make your revision easier

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

Can you help? Study help unanswered threads

## Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.