Moment of a Force | Mechanics Statics | (Learn to solve any question)

Learn about moments or torque, how to find it when a force is applied at a point, 3D problems and more with animated examples. We talk about the line of action, breaking forces into components and using that to find moments, and resultant moments. We also go into using the cross product to figure out the moment as well.

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Intro(00:00)
Determine the moment of each of the three forces about point A. (02:24)
The 70-N force acts on the end of the pipe at B. (04:30)
The curved rod lies in the x–y plane and has a radius of 3 m. (05:25)
Determine the moment of this force about point A. (06:28)
Determine the resultant moment produced by forces (06:58)

Book used: R. C. Hibbeler and K. B. Yap, Engineering Mechanics Statics.
Hoboken: Pearson, 2017.

[QuestionSolutions]

🔹Please note there is a typo at 6:23. The "k" term is negative, not positive, so it's {-128.34i + 128.34j - 256.68k}
🔹At 6:31, there is a typo in the question, we are finding the moment about point B, NOT A. This is a typo in the question only, all steps are correct.

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[kentpimentel]

I got -128.34i +128.34j -256.68k for the cross product in 6:24.