Moment and torque?

[pray4mojo]

See topic.

 

[Howard]

To the layperson, definitely not.

 

[pray4mojo]

Originally posted by: Howard
To the layperson, definitely not.

How about to one who isn't a layperson like an engineer perhaps?

 

[soydios]

Moment of inertia = angular equivalent of mass
A spinning disk or ring has inertia, yes? But, this inertia is different from linear inertia. The "mass" that causes angular inertia is dependent on both the mass of the object, its radius, and the distribution of mass within the object. To find the inertia of an object in angular (circular) motion, multiply the angular speed (often expressed in radians per second) times the moment of inertia.

Torque = angular equivalent of force
Torque is angular force. It's dependent on both force applied and the radius of the lever used to apply it. For example, a bigger wrench puts more torque around a central point (the bolt) than a smaller wrench.

 

[Safeway]

There is also a bending moment.

 

[Toastedlightly]

There's also a banana moment....


the moment I am going to eat a banana.

 

[EvilYoda]

Oh, there's plenty of hair-pulling difference...I'll take calc/diff eq/linear algebra any day over that stuff

 

[FleshLight]

Vector Mechanics for engineers says M sub O = r x F = tau

 

[dighn]

Originally posted by: soydios
Moment of inertia = angular equivalent of mass
A spinning disk or ring has inertia, yes? But, this inertia is different from linear inertia. The "mass" that causes angular inertia is dependent on both the mass of the object, its radius, and the distribution of mass within the object. To find the inertia of an object in angular (circular) motion, multiply the angular speed (often expressed in radians per second) times the moment of inertia.

Torque = angular equivalent of force
Torque is angular force. It's dependent on both force applied and the radius of the lever used to apply it. For example, a bigger wrench puts more torque around a central point (the bolt) than a smaller wrench.

moment of inertia is different. as far as I was taught and from what I can find, moment is torque, at least in terms of mechanics.

 

[NatePo717]

Originally posted by: FleshLight
Vector Mechanics for engineers says M sub O = r x F = tau

I have that book... By Beer?

I think of moments as being used to replace point loads at a distance mainly with beams and rods.

I think of torques as being used with gears, pulleys, or other rotational objects.

 

[txrandom]

There is also dipole moment.

 

[LordMorpheus]

When a mechanical engineer talks about the moment in a beam he's generally talking about the bending moment (the torque applied to and in the beam causing it to bend).

Torque (though mathematically the same thing) is used to talk about torque on the beam causing it to twist.

I've got two or three texts that do things that way. As long as you keep track of your vectors you don't really need to make the distinction, though.

 

[pray4mojo]

Originally posted by: NatePo717

Originally posted by: FleshLight
Vector Mechanics for engineers says M sub O = r x F = tau

I have that book... By Beer?

I think of moments as being used to replace point loads at a distance mainly with beams and rods.

I think of torques as being used with gears, pulleys, or other rotational objects.

I use that book too. Torque isn't in the index. :shocked:

 

[Goosemaster]

Originally posted by: pray4mojo

Originally posted by: NatePo717

Originally posted by: FleshLight
Vector Mechanics for engineers says M sub O = r x F = tau

I have that book... By Beer?

I think of moments as being used to replace point loads at a distance mainly with beams and rods.

I think of torques as being used with gears, pulleys, or other rotational objects.

I use that book too. Torque isn't in the index. :shocked:

Same book here too

 

[FleshLight]

Originally posted by: Goosemaster

Originally posted by: pray4mojo

Originally posted by: NatePo717

Originally posted by: FleshLight
Vector Mechanics for engineers says M sub O = r x F = tau

I have that book... By Beer?

I think of moments as being used to replace point loads at a distance mainly with beams and rods.

I think of torques as being used with gears, pulleys, or other rotational objects.

I use that book too. Torque isn't in the index. :shocked:

Same book here too

I think its the de facto standard for mechanics. My professor says he used the 3rd edition of the book 50 years ago when he took the same class