What is the difference among moment, torque and couple?

Click For Summary
SUMMARY

The discussion clarifies the distinctions and relationships among moment, torque, and couple. Moment and torque are defined by the equation Moment = Fd and Torque = Fd, where 'F' represents force and 'd' represents distance. A couple consists of two equal and opposite forces that do not act along the same line, resulting in a consistent total torque regardless of the chosen point of reference. The total torque of a couple is calculated using the formula G = Fdperp, where dperp is the perpendicular distance between the forces' lines of action.

PREREQUISITES
  • Understanding of basic physics concepts such as force and distance
  • Familiarity with the equations of motion
  • Knowledge of vector analysis in physics
  • Basic grasp of mechanical systems and their components
NEXT STEPS
  • Study the principles of static equilibrium in mechanical systems
  • Learn about the applications of torque in engineering design
  • Explore the concept of rotational dynamics and its equations
  • Investigate real-world examples of couples in mechanical systems
USEFUL FOR

Students of physics, mechanical engineers, and professionals involved in design and analysis of mechanical systems will benefit from this discussion.

qpzm77gg
Messages
19
Reaction score
0
What is the difference among moment, torque and couple?

Moment = Fd
Torque = Fd
Couple mean two forces have same magnitude but opposite direction.

What is the relationship among them?
 
Physics news on Phys.org
Moment and torque mean exactly the same. You must always specify the point about which you are finding the moment (or torque) of a force. A given force will have different moments (or torques) depending on your choice of point.

A couple is a pair of equal and opposite forces not acting in the same straight line. What's special about a couple is that the total torque of such forces is the same about whichever point we choose. It is given by
G=Fd_{perp} in which d_{perp} is the perpendicular separation of the lines of action of the two forces. This is easy to show.
 

Similar threads

  • · Replies 6 ·
Replies
6
Views
1K
  • · Replies 49 ·
2
Replies
49
Views
4K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 69 ·
3
Replies
69
Views
6K
  • · Replies 67 ·
3
Replies
67
Views
7K
  • · Replies 17 ·
Replies
17
Views
1K
  • · Replies 2 ·
Replies
2
Views
3K
  • · Replies 6 ·
Replies
6
Views
914