How are moments defined and used in physics?

  • Thread starter Thread starter princejan7
  • Start date Start date
  • Tags Tags
    Moment
AI Thread Summary
A moment in physics refers to a force acting on a lever arm that induces rotation about an axis, often synonymous with torque. It is defined by the perpendicular distance from a point to a line or surface, connecting to the broader mathematical concept of moments. Various types of moments include moment of inertia, moment of force, moment of momentum, and magnetic moment. These concepts are essential in understanding rotational dynamics and the behavior of physical systems. Overall, moments play a critical role in analyzing forces and their effects in physics.
princejan7
Messages
93
Reaction score
0
moment of a force, magnetic moment, moment of momentum etc

what is a moment in general?
 
Physics news on Phys.org
A moment is a force acting on a lever arm that will try to cause a rotation about an axis. Some people like to use the word torque instead.
 
See this:
http://en.wikipedia.org/wiki/Moment_(physics )
In physics, moment relates to the perpendicular distance from a point to a line or a surface, and is derived from the mathematical concept of moments.[1] It is frequently used in combination with other physical quantities as in moment of inertia, moment of force, moment of momentum, magnetic moment and so on.
 
Last edited by a moderator:
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

General question about the definition of moment of force (Torque)
Replies
7
Views
745
How do I find the intersection of the wrench's LOA?
Replies
4
Views
1K
Confused about how forces in a pulley balance
Replies
6
Views
892
When are reactive forces enough to support this body?
Replies
14
Views
1K
What is the "r" in the moment of inertia?
Replies
13
Views
2K
How to take a moment into account for deflection of a beam
Replies
8
Views
2K
Correct Use of the Parallel Axis Theorem for Moment of Inertia
Replies
2
Views
2K
Understanding The Concept Of Moments
Replies
6
Views
2K
Need Help with Physics Moment and Force Questions
Replies
7
Views
2K
Why is a current ring approx a magnetic dipole from very far off?
Replies
7
Views
2K

Hot Threads

Recent Insights

Back
Top