Homework declare

In this question , we can see the in teh second picture , the 12.86kNm is in clockwise direction in ~ the right of expectancy BC .

Homework Equations

The attempt at a Solution

In meachnic of materials , i learnt that when the beam curve upwards ( U shape) , climate it has actually positive bending moment ... For this reason , i agree the the 1.54kNm clockwise rotation on the left the span abdominal has POSITIVE moment ... Yet , i dont agee that the 12.86kNm is in clockwise direction at the best of span BC has POSTIVE worth ( it"s -12.86kNm on the left , so optimistic 12.86kNm is included to carry the minute to 0 at C) ... Ns think the -12.86kNm ~ above the right of span BC will lead to an adverse moment

Homework statement

In this concern , we have the right to see the in teh 2nd picture , the 12.86kNm is in clockwise direction in ~ the appropriate of expectancy BC .

You are watching: Is clockwise positive or negative moment

Homework Equations

The effort at a Solution

In meachnic of products , i learnt that when the beam curve upwards ( U shape) , climate it has actually positive bending minute ... So , ns agree the the 1.54kNm clockwise rotation ~ above the left of span abdominal muscle has POSITIVE minute ... However , ns dont agee the the 12.86kNm is in clockwise direction in ~ the right of expectancy BC has actually POSTIVE worth ( it"s -12.86kNm ~ above the left , so optimistic 12.86kNm is added to bring the minute to 0 at C) ... Ns think the -12.86kNm top top the right of span BC will lead to negative moment
Yes, the ends are both fixed and also at the left end the deflected curve is upwards, or positive minute by convention, and at the right end the deflected curve is bottom so the minute is negative. So the moment is -12.86 in ~ the ideal end.Note when illustration the minute diagram, fixed finish moments and applied couples , once acting clockwise , include to the minute diagram as a confident value. That is why in ~ C the cw minute of 12.86 is added as a plus to bring the minute to 0 a hair come the ideal of C. However by convention, the fixed end moment at C is without doubt a an unfavorable 12.86. The can acquire confusing, for sure.
*
Likesfonseh
Note when illustration the minute diagram, fixed finish moments and also applied couples , as soon as acting clockwise , include to the minute diagram together a hopeful value. The is why in ~ C the cw minute of 12.86 is included as a add to to bring the minute to 0 a hair to the best of C.

See more: How Many Revolutions Are In A Mile Chart, How To Convert Elliptical Strides To Miles


Do you typical for the clockwise minute 12.86kNm has actually to come to be counterclockwise 12.86kNm moment when drawing moment diagram ? This will cause positive 12086kNm ? If it"s so , why we have to do for this reason ? Why we need to make the 12.86kNm clockwise moment to end up being couterclockwise when illustration moment diagram ?
Do you typical for the clockwise moment 12.86kNm has actually to come to be counterclockwise 12.86kNm minute when drawing moment diagram ? This will bring about positive 12086kNm ?
If it"s for this reason , why we need to do so ? Why we need to make the 12.86kNm clockwise moment to end up being counterclockwise when illustration moment diagram ?
By convention, clockwise moments are an adverse when acting on a ar to the left of it, and clockwise moments are positive when acting on a ar to the best of it. Similarly, counterclockwise moments are positive as soon as acting ~ above a ar to the left that it, and counterclockwise moment are an unfavorable when exhilaration on a ar to the right of it. So in your case, the 12.86 minute acts clockwise on a section to the left that it, and also is for this reason negative. Quite confusing ns know, so that is constantly a good idea to around sketch in the deflected form of the beam, and if it deals with upward it is a positive minute in the region, and when it deals with downward, the is a an adverse moment in that region.Now when drawing your minute diagram native left come right, the fixed end moments allude upward as soon as clockwise, and downward when counterclockwise.If you are still confused, don"t be, since your last map out showing confident and negative moments is correct.