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It doesn't matter whether it's a straight beam or a curve, you calculate moments the same way. The moment is a force multiplied by its perpendicular distance from the point of rotation.

There is one thing you will need to consider while preparing your mobile, the location of the center of mass of the curved pieces. If you are using a rectangular piece of wood, for example, the COM is located at the the midpoint of the length and of the width. So, you can support the piece at the COM.

With a curve, the COM could be at a point in the space around the object. Think of a donut - it's COM is in the middle of the hole. You could have a harder time getting everything into equilibrium.

It's not a monumental challenge to overcome, just something for you to think about as you layout your pieces. Good luck.

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13y ago
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12y ago

If the turning force is on the right, the moment is clockwise

If on the left, the moment is anticlockwise.

If there are two moments then you have to perform the calculation to determine which side of the pivot is experiencing the greater moment.

The formula is: Moment = force times perpendicular distance from pivot

Side of pivot with greatest moment subtract other moment = turning force on the side of the pivot with greatest moment

EG

500N 4m from pivot------------------/\--------------------300N 6m from pivot

2000Nm-------------------------/\----------------------------1800Nm

=200N anticlockwise

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Q: How do you measure clockwise or anticlockwise moments?
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