Is -16kN*m Equivalent to 16kN*m CW?

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In summary, the conversation is about determining the moment of a 10kN force applied at point A about point O. There is a question about the sign of the moment, as the direction of rotation is clockwise. The book and solution manual state that the moment is 16kN*m CW, but the asker is confused if this means they do not need to include the negative sign. They also mention a comparison to going 20MPH west and -20MPH east.
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pyroknife
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The 10kN force is applied at point A. Determine the moment of F about point O.


I attached the image. I have a question regarding the sign. The direction of rotation is clockwise, wouldn't that mean the moment is (-)? The right-hand rule also points your thumb into the page which means it's negative. The book&solution manual, however, is saying that it is 16kN*m CW. Is the "CW" (clockwise) basically means you don't have to put the (-) sign? I'm confused. Does -16kN*m=16kN*m CW?
 

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pyroknife said:
The 10kN force is applied at point A. Determine the moment of F about point O.


I attached the image. I have a question regarding the sign. The direction of rotation is clockwise, wouldn't that mean the moment is (-)? The right-hand rule also points your thumb into the page which means it's negative. The book&solution manual, however, is saying that it is 16kN*m CW. Is the "CW" (clockwise) basically means you don't have to put the (-) sign? I'm confused. Does -16kN*m=16kN*m CW?

It is the samething as going 20MPH west equals going -20MPH east.
 

FAQ: Is -16kN*m Equivalent to 16kN*m CW?

What is the Moment Problem in Statics/Physics?

The moment problem in statics/physics refers to the calculation of a physical quantity known as the moment of a force. This moment is a measure of the tendency of a force to cause rotation around a particular point or axis. It is an important concept in understanding the equilibrium of objects and structures.

How is the Moment of a Force Calculated?

The moment of a force is calculated by multiplying the magnitude of the force by the perpendicular distance from the point of rotation (or axis) to the line of action of the force. This can be represented mathematically as M = F x d, where M is the moment, F is the force, and d is the distance.

What is the Difference between a Positive and Negative Moment?

A positive moment indicates that the force is causing a clockwise rotation around the point or axis, while a negative moment indicates a counterclockwise rotation. This is determined by the direction of the force and the direction of the perpendicular distance.

How is the Moment Problem Used in Real-World Applications?

The moment problem is used extensively in engineering and physics to analyze and design structures, machines, and other systems. It helps determine the forces and supports needed to ensure stability and prevent failure under different loading conditions.

Can Moments be Added Together?

Yes, moments can be added together using the principle of superposition. This means that the total moment acting on an object is equal to the sum of the individual moments acting on it. This is a useful concept in solving complex statics/physics problems involving multiple forces and moments.

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