- #1

tomtomtom1

- 160

- 8

- Homework Statement
- - Turning Moment

- Bending Moment

- Moment of Force

- Relevant Equations
- - Turning Moment

- Bending Moment

- Moment of Force

Hello all;

I am trying to better understand the idea of Moments.

I know how to calculate moments i.e. Distance * Perpendicular Force.

My understanding was that moments were any push/pull force that creates a turning action about some point - that is what a moment is to me, I have shown this in the diagram below:-

However people have used the terms:-

- Turning Moment

- Bending Moment

- Moment of Force

It is these terms that are confusing me. I think Turning Moment and Moment of Force are the same thing & these terms satisfy my definition of what a Moment is (please say I'm right).

But the term Bending Moment has been used with the following diagram:-

In this diagram I feel that the term Bending Moment means something different and its confuses me. I thought that Bending Moment in this case meant calculating how much the beams bend from its original position but I have since been told that this is incorrect.

I can see how a turning action can be cause because the F2 (10kN) force acting downwards taken about F1 would introduce a clockwise turning action, so I would get Moment Taken About F1 = 3 * 10kN = 30kNm.

But what does 30kNm moment taken about F1 actually mean?

Is the 30kNm acting at position F1 or acting at position F2?

Is 30kNm another force, is it a force that internal to the beam ?

I really was hoping someone could explain.

Thank you.

I am trying to better understand the idea of Moments.

I know how to calculate moments i.e. Distance * Perpendicular Force.

My understanding was that moments were any push/pull force that creates a turning action about some point - that is what a moment is to me, I have shown this in the diagram below:-

- Turning Moment

- Bending Moment

- Moment of Force

It is these terms that are confusing me. I think Turning Moment and Moment of Force are the same thing & these terms satisfy my definition of what a Moment is (please say I'm right).

But the term Bending Moment has been used with the following diagram:-

In this diagram I feel that the term Bending Moment means something different and its confuses me. I thought that Bending Moment in this case meant calculating how much the beams bend from its original position but I have since been told that this is incorrect.

I can see how a turning action can be cause because the F2 (10kN) force acting downwards taken about F1 would introduce a clockwise turning action, so I would get Moment Taken About F1 = 3 * 10kN = 30kNm.

But what does 30kNm moment taken about F1 actually mean?

Is the 30kNm acting at position F1 or acting at position F2?

Is 30kNm another force, is it a force that internal to the beam ?

I really was hoping someone could explain.

Thank you.