# Moment

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#1
Define the moment of a couple? (2)
Can i have a proper definition , every mark scheme is different?
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5 years ago
#2
(Original post by Ayaz789)
Define the moment of a couple? (2)
Can i have a proper definition , every mark scheme is different?
The moment of a couple is the product of either of the forces of magnitude of the couple and the perpendicular distance between those forces. For example, if two forces of magnitude acted on a body and the perpendicular distance between them was , the moment would be: 1
#3
If i wrote Moment is the force * the perpendicular distance , would i get 2 marks?
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5 years ago
#4
(Original post by Ayaz789)
If i wrote Moment is the force * the perpendicular distance , would i get 2 marks?
I'm no examiner but I think that what you just typed would earn one mark. The question asks specifically for the moment of a couple, so you should specify which force and which distance should be used in the calculation. Of course for two marks, do not include the diagram and example. I would probably write the following:

'(The moment of a couple is) the product of the magnitude of one the forces in a couple and the perpendicular distance between those two forces.'
1
#5
(Original post by Smithenator5000)
I'm no examiner but I think that what you just typed would earn one mark. The question asks specifically for the moment of a couple, so you should specify which force and which distance should be used in the calculation. Of course for two marks, do not include the diagram and example. I would probably write the following:

'(The moment of a couple is) the product of the magnitude of one the forces in a couple and the perpendicular distance between those two forces.'
But in the ms it says the force * perpendicular distance at a given point?
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5 years ago
#6
(Original post by Ayaz789)
But in the ms it says the force * perpendicular distance at a given point?
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#7
(Original post by Smithenator5000)
Im on my phone rn so ill send it tonight
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5 years ago
#8
(Original post by Ayaz789)
Im on my phone rn so ill send it tonight
Okay, then.
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5 years ago
#9
I would define a moment as:

Force * perpendicular distance (to the line of action of the force), from a pivot point.
1
#10
(Original post by Wunderbarr)
I would define a moment as:

Force * perpendicular distance (to the line of action of the force), from a pivot point.
That would get me 2 marks yeah
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5 years ago
#11
(Original post by Ayaz789)
That would get me 2 marks yeah
Just remember, moments exist because there are forces that cause rotation around a pivot point, at a distance from the pivot point.

So the part about a "at a given point" is pretty much essential.

Lastly, the perpendicular distance is the shortest distance to the line of action of the force.
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#12
(Original post by Wunderbarr)
Just remember, moments exist because there are forces that cause rotation around a pivot point, at a distance from the pivot point.

So the part about a "at a given point" is pretty much essential.

Lastly, the perpendicular distance is the shortest distance to the line of action of the force.
Okay thanks.
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5 years ago
#13
the moment when a couple breaks up
yaay he's available
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5 years ago
#14
(Original post by iqra2159)
the moment when a couple breaks up
yaay he's available
lol wth
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5 years ago
#15
(Original post by Ayaz789)
Define the moment of a couple? (2)
Can i have a proper definition , every mark scheme is different?
"Force multiplied by the perpendicular distancce from the pivot"
0
5 years ago
#16
(Original post by voltz)
"Force multiplied by the perpendicular distancce from the pivot"
Consider the fact that he said "of a couple". There are 2 forces in action here, both with equal magnitude and opposite direction as one of the first posters said.

What you defined was a moment. The moment of a couple would be:

The magnitude of one of the forces within a couple multiplied by the perpendicular distance between the two forces.
0
5 years ago
#17
(Original post by M0nkey Thunder)
Consider the fact that he said "of a couple". There are 2 forces in action here, both with equal magnitude and opposite direction as one of the first posters said.

What you defined was a moment. The moment of a couple would be:

The magnitude of one of the forces within a couple multiplied by the perpendicular distance between the two forces.
That would not be the moment, it would be the torque you are calculating.

Moment: Force multiplied by pependicular distance from the pivot

Torque: One force in a couple force multiplied by the perpendicular distance between the two forces.
0
5 years ago
#18
(Original post by voltz)
That would not be the moment, it would be the torque you are calculating.

Moment: Force multiplied by pependicular distance from the pivot

Torque: One force in a couple force multiplied by the perpendicular distance between the two forces.
But the problem is, the OP is calculating the moment of a couple. There is no reference to a pivot and so you must assume that they mean a torque.
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