Tuesday, September 02, 2014 11:45 AM (GMT +5)

 Home Beginner's Guide Rules Syllabus Past Papers CSP Members

 CSS Forums Difference between torque and moment.
 Home Register Awards Members List Social Groups Search Today's Posts Mark Forums Read

#1
Sunday, January 29, 2012
 42nd CTP (OMG) Join Date: Jan 2012 Posts: 149 Thanks: 438 Thanked 109 Times in 78 Posts
Difference between torque and moment.

Is there any difference between torque and moment?
According to my understanding both are same.
Both produce turning effect and both measured as force into distance.
Does that mean torque and moment are two names of the same phenomenon?
#2
Monday, January 30, 2012
 Senior Member Join Date: Sep 2011 Location: land of rising sun Posts: 336 Thanks: 30 Thanked 197 Times in 151 Posts

torque=moment=moment of force
#3
Monday, January 30, 2012
 42nd CTP (OMG) Join Date: Jan 2012 Posts: 149 Thanks: 438 Thanked 109 Times in 78 Posts

okk! so torque and moment , are one and the same thing and can be used interchangeably. is it so?
#4
Monday, January 30, 2012
 Senior Member Join Date: Jan 2008 Location: city of miTTi kaTTA Posts: 892 Thanks: 1,569 Thanked 791 Times in 438 Posts

torques are moment but not all moments are torque
torque is tunneling effect with revolutions like around a pivot .moment is also for non-revolutionry system
__________________
Jo ALLAH karay c .. o sohna karay c
jab bhi kaam aaya mera PARVARIGAAR kaam aaya
#5
Monday, January 30, 2012
 42nd CTP (OMG) Join Date: Jan 2012 Posts: 149 Thanks: 438 Thanked 109 Times in 78 Posts

"torques are moment but not all moments are torque"
Could you please elaborate this point?
-
What i understood, a force is applied on a pivot, the turning effect produced is torque.
And what if a force is applied on a structural member, say beam, will torque be produced in it too? In engineering, we use , moment is produced in the beam. Does this moment = torque?
#6
Monday, January 30, 2012
 Senior Member Join Date: Aug 2011 Location: Wazirabad Posts: 433 Thanks: 131 Thanked 363 Times in 192 Posts
Although I'm not science student but i'll try to explain

Torque, moment or moment of force, is the tendency of a force to rotate an object about an axis,fulcrum, or pivot. Just as a force is a push or a pull, a torque can be thought of as a twist.
Loosely speaking, torque is a measure of the turning force on an object such as a bolt or a flywheel. For example, pushing or pulling the handle of a wrench connected to a nut or bolt produces a torque (turning force) that loosens or tightens the nut or bolt.

Torque and moment are often used interchangeably. Most people are confused when asked the difference between moment and torque. The terms torque and moment originated with the study conducted by Archimedes on levers. Torque (most commonly used) or moment (used by engineers) is a concept of turning force. This turning force is applied when we push a door or try to open a nut using spanner. Both the door and the spanner turn about a point called the pivot or fulcrum. The force that is applied is at some distance from this fulcrum. The turning effect of the force applied depends upon this distance from the pivot or fulcrum.

Moment = Force* Perpendicular distance from the pivot

From this equation, it is clear that if we want to complete the task using less force, we have to increase the distance from the pivot.
In contrast, when a car driver turns a steering wheel, he exerts two equal and opposite forces on the steering. These forces form a couple and the turning effect of this couple is the sum of the moment of the two forces. The moment of a couple is called Torque.

Torque= Force*Perpendicular distance between the two perpendicular forces

In common parlance, Torque and moment are used interchangeably. Torque, or the moment of a force is its ability to rotate an object about an axis. While force is applied in torque as well, force is a push or a pull but in torque this force is in the form of a twist.

For the students of mechanical engineering, the two terms are different and not interchangeable. In general moment is the term used when referring to the ability of a force to turn an object about its axis. Torque is a special application of moment. When there are two equal and opposite forces, they form a couple, and the moment that results is called a torque. Here the applied force vectors are zero.
__________________
If you don't have option(s), you are an option.
 The Following User Says Thank You to marslanqaisar For This Useful Post: ravaila (Wednesday, February 01, 2012)
#7
Monday, January 30, 2012
 Junior Member Join Date: Jan 2011 Location: Pakistan Council of Scientific and Industrial Research, Peshawar Posts: 12 Thanks: 0 Thanked 6 Times in 3 Posts

do not worry about the difference
at this stage u just have to memorize the definition.
Momentum is the product of mass and velocity that is P = mv its unit is Kg.m/sec
Torque can be defined as the turning effect of a force
if u are asking of difference then in simple words torque deals with rotation and momentum with linear motion
f u need more explainantion u can ask
#8
Monday, January 30, 2012
 Junior Member Join Date: Jan 2011 Location: Pakistan Council of Scientific and Industrial Research, Peshawar Posts: 12 Thanks: 0 Thanked 6 Times in 3 Posts
torque and momentum are not the same

Quote:
 Originally Posted by ravaila torques are moment but not all moments are torque torque is tunneling effect with revolutions like around a pivot .moment is also for non-revolutionry system
torque is the turning effect and momentum is quantity of motion in a body
these are entirely different things
although torque is the rotational analogue of force, it have no such relation with momentum.
torque is denoted by T(ta) having a unit of N-m
T= r * F(r= moment arm, F= force)
momentum is denoted by P
P = mv(m= mass, v= velocity)
#9
Tuesday, January 31, 2012
 42nd CTP (OMG) Join Date: Jan 2012 Posts: 149 Thanks: 438 Thanked 109 Times in 78 Posts

umm okk thankyou guys.
-
-
And i had to worry about this difference as it came to my mind a couple of days ago and since then it has been bugging me to the extent that i couldn't concentrate on anything else!
#10
Tuesday, January 31, 2012
 Junior Member Join Date: Jan 2011 Location: Pakistan Council of Scientific and Industrial Research, Peshawar Posts: 12 Thanks: 0 Thanked 6 Times in 3 Posts

yar i could understand moment
r u asking for moment arm????
brother im trying to answer ur question satisfactorily but for that u have to explain ur question
i advised u because there are certain concepts which can not be cleared this time rather their details would confuse u further