# Equilibrium and Forces Revision

What are the two conditions for equilibrium?
No resultant force and no resultant moment
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What is the principle of moments?
For an object not to rotate. Equal forces on both sides and everything is level
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What is stable equilibrium?
If tilted, the object will move back to its original position without toppling
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What is unstable equilibrium?
If tilted even slightly, the object will topple one way or another
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How do you work out a moment?
Force x Perpendicular distance between the pivot and the line of action of the force (M = F x d)
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What is the definition of centre of mass?
The centre of mass of a body is the point where a single force on the body has no turning effect
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What is the definition of centre of gravity?
A point from which the weight of a body may be considered to act. In uniform gravity, it is the same as the centre of mass
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How do you work out the moment of a Couple?
One force x Distance between the two forces
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What is a Couple?
A pair of equal and opposite forces acting on a body but not along the same line
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What is the equation that fits with the principle of moments?
What is the equation that fits with the principle of moments?
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## Other cards in this set

### Card 2

#### Front

What is the principle of moments?

#### Back

For an object not to rotate. Equal forces on both sides and everything is level

### Card 3

#### Front

What is stable equilibrium?

### Card 4

#### Front

What is unstable equilibrium?

### Card 5

#### Front

How do you work out a moment?

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