Processing Math: Done
13. Moments
From Mechanics
(Difference between revisions)
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== '''Key Points''' == | == '''Key Points''' == | ||
- | The moment of | + | The moment of a force about the point <math>O</math> is the product of the force and the perpendicular distance to the line of action of the force from <math>O</math>. |
[[Image:T13.1.GIF]] | [[Image:T13.1.GIF]] | ||
- | |||
<math>\text{Moment }=Fd</math> | <math>\text{Moment }=Fd</math> | ||
[[Image:T13.2.GIF]] | [[Image:T13.2.GIF]] | ||
- | |||
<math>\text{Moment }=Fd\sin \theta </math> | <math>\text{Moment }=Fd\sin \theta </math> | ||
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Anti-clockwise moments are positive. | Anti-clockwise moments are positive. | ||
- | + | The resultant moment about <math>O</math> is the sum of the moments about <math>O</math>. | |
'''[[Example 13.1]]''' | '''[[Example 13.1]]''' |
Revision as of 13:42, 8 March 2010
Theory | Exercises |
Key Points
The moment of a force about the point
Clockwise moments are negative.
Anti-clockwise moments are positive.
The resultant moment about
For the rectangular lamina shown below, find the total moment of the forces acting, about the corner marked O.
Solution
Force | Moment (Nm) |
5N at O | ![]() |
8 N | ![]() |
7 N | ![]() |
6 N | ![]() |
5 N | ![]() |
4 N | ![]() |
Total Moment | |