GCSE Level Questions: Moments and Centre of Gravity
General Pointers  Things to think about before attemptong these questions

Centre of mass is the same as centre of gravity. It is the point through which the weight of the object acts. You draw the weight arrow vertically down from that point.

If an object is made up of various parts and you move one of those parts the centre of mass/gravity of the whole thing will move position  and that may affect the overall stability.

NEVER use the word momentum instead of moment – they are quite different!

A point can never be parallel or perpendicular to anything!

A moment has two parts – if the moment is greater that can be due to either part. Therefore if a moment is 'greater' it is wrong to say ‘the force of the moment increases’ unless you are talking about the ‘force part’ of the moment.

A resultant moment will cause an object to turn – a resultant force will produce an acceleration (F = ma)

'm' is the abbreviation for mass NOT the abbreviation for moment! Always write the word 'moment' for a moment  never abbreviate it to 'm' or 'M'
Click on a question number to view one of the following questions  a rough guide to content is given to help you choose!
A solution to each question is linked from the question page.
The mark scheme is in red; and comments to help you understand why the marks are awarded in that way are in green.
Click here to go to the notes on moments
and here for notes on centre of gravity

Q1. 
6 marks 
Stability of a computer monitor. 
Q2. 
6 marks 
Stability of a mobile crane 
Q3. 
6 marks 
Child's mobile and the stability of a ladder  device to increase the stability 
Q4. 
5 marks 
Using a spanner 
Q5. 
5 marks 
Lampshade 


