Moments and which direction they act

  • #1
if i have a fixed x and y axis and i have a few forcesin both negative and positive directions when i calculate the sum of the moments how am I meant to know which direction they act

M=Fd
 

Answers and Replies

  • #2
radou
Homework Helper
3,115
6
All you need is a convention, i.e. set one direction "of rotation" clockwise and the other counter clockwise - one set of vectors will then produce positive moments, and the other one negative.
 
  • #3
2
0
generally, if a force causes clockwise rotation it's considered negative. counter clockwise is positive, it depends on what your standards are.
if it's in 3D, the rxF will take negative forces and position vectors into consideration
 

Related Threads on Moments and which direction they act

  • Last Post
Replies
3
Views
12K
  • Last Post
Replies
2
Views
3K
  • Last Post
Replies
8
Views
3K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
2
Views
907
Replies
5
Views
3K
B
  • Last Post
Replies
12
Views
6K
  • Last Post
Replies
14
Views
4K
Replies
20
Views
5K
  • Last Post
Replies
5
Views
2K
Top