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

# A Level M1 Newtons Law Questions watch

1. Hi,
So in M1 (aqa) when calculating tension you can use either T - mg = ma or mg - T = ma. But I am not sure when to use which one. I know that it has something to do with tension being the greatest force or something.

Any help will be appreciated.
2. The equation shows that the net force is equal to ma, so if tension is larger than weight, the resultant force will be in the direction of the tension, so T - mg = ma. If weight was larger, the opposite would be true,
3. (Original post by JN17)
The equation shows that the net force is equal to ma, so if tension is larger than weight, the resultant force will be in the direction of the tension, so T - mg = ma. If weight was larger, the opposite would be true,
Thanks for the reply, I found out which way around the equations should be.

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: May 31, 2016
Today on TSR

### Happy St Patrick's day!

How are you celebrating?

### Stay at sixth form or go to college?

Discussions on TSR

• Latest
Poll
Useful resources

### 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

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest

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