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Welcome to our Physics lesson on Conditions of Equilibrium, this is the seventh lesson of our suite of physics lessons covering the topic of Moment of Force. Conditions of Equilibrium, you can find links to the other lessons within this tutorial and access additional physics learning resources below this lesson.
Conditions of Equilibrium
In the tutorial "Newton's Second Law of Motion", we saw that an object is in equilibrium if it tends to move linearly and the forces acting on it are balanced. Thus, if we want to set in equilibrium such an object or system, we must meet the following condition:
F⃗R = F⃗1 + F⃗2 + F⃗3 + … = 0
This is known as the first condition of equilibrium. It is valid for translational (linear) motion
On the other hand, if the system tends to rotate around a fixed point, the equilibrium is settled only when the resultant moment of force is zero, i.e. when
M⃗R = M⃗1 + M⃗2 + M⃗3 + … = 0
Or
M⃗R = F⃗1 × ∆x⃗1 + F⃗2 × ∆x⃗2 + F⃗3 × ∆x⃗3 + … = 0
The above equation is known as the second condition of equilibrium. It is valid for circular motion around a fixed point.
You have reached the end of Physics lesson 6.4.7 Conditions of Equilibrium. There are 7 lessons in this physics tutorial covering Moment of Force. Conditions of Equilibrium, you can access all the lessons from this tutorial below.
More Moment of Force. Conditions of Equilibrium Lessons and Learning Resources
Centre of Mass and Linear Momentum Learning Material| Tutorial ID | Physics Tutorial Title | Tutorial | Video
Tutorial | Revision
Notes | Revision
Questions |
|---|
| 6.4 | Moment of Force. Conditions of Equilibrium | | | | |
| Lesson ID | Physics Lesson Title | Lesson | Video
Lesson |
|---|
| 6.4.1 | What is Moment of Force? | | |
| 6.4.2 | What happens if the acting force is not normal to the bar? | | |
| 6.4.3 | What happens if more than two forces are acting on a turning system? | | |
| 6.4.4 | What happens if there is no equilibrium in a turning system? | | |
| 6.4.5 | What if the bar is heavy and as such, we cannot neglect its weight? | | |
| 6.4.6 | What if the bar is hanged on a string? | | |
| 6.4.7 | Conditions of Equilibrium | | |
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