# Explain why moment reduces to zero.

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#1
I have a fairly simple question which is:
Explain why the moment of the weight reduces to zero when the plate reaches the bottom of the swing.

There is a diagram of an irregular shaped object with pivot point P and Weight 6N is 0.5m away.

I know that the moment will reduce to zero but I don't really know why. The question is only worth 1 mark so its not urgent that I find the answer but I would appreciate an explanation of why this happens.
0
1 month ago
#2
(Original post by DavySp)
I have a fairly simple question which is:
Explain why the moment of the weight reduces to zero when the plate reaches the bottom of the swing.

There is a diagram of an irregular shaped object with pivot point P and Weight 6N is 0.5m away.

I know that the moment will reduce to zero but I don't really know why. The question is only worth 1 mark so its not urgent that I find the answer but I would appreciate an explanation of why this happens.
Which direction are the forces pointing, compared to the "rope"?
0
1 month ago
#3
Maybe because the horizontal distance between the Weight and point P reduces to zero.

hence,moment will be zero.
Last edited by AW AFR; 1 month ago
0
#4
(Original post by AW AFR)
Maybe because the horizontal distance between the Weight and point P reduces to zero.

hence,moment will be zero.
thank you, I wasn't sure how to phrase it but this helped.
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1 month ago
#5
(Original post by DavySp)
I have a fairly simple question which is:
Explain why the moment of the weight reduces to zero when the plate reaches the bottom of the swing.

There is a diagram of an irregular shaped object with pivot point P and Weight 6N is 0.5m away.

I know that the moment will reduce to zero but I don't really know why. The question is only worth 1 mark so its not urgent that I find the answer but I would appreciate an explanation of why this happens.
Bit of a guessing game without the diagram. But:

Their is tension in the rope, it has a horizontal & vertical element, and weight acting on the object.

At the moment the the plate reaches the bottom of the swing the horizontal element of the swing has a distance of 0. And the vertical element the tension and force of weight are equal & opposite so the net force is 0. Hence the moment is 0.
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