# Physics P3 2.4 Stability.

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How is the stability of an object increased?
By making its base as wide as possible and its centre of mass as low as possible.
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When will an object tend to topple over?
If the line of action of its weight is outside its base. Also ab object topples over if the resultant moment about its point of turning is not zero.
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Where does the line of action of the weight of an object act?
Through its centre of mass.
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What happens if the line of action of the weight lies outside the base of an object?
There will be a resultant moment and the object will topple over.
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The wider the base of an object, and the lower its centre of mass....?
The further it has to tilt before the line of action of the weight moves outside the base.
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Why does hanging heavy bags from the handle of a pushchair make it more likely to topple over?
The bags raise the centre of mass so the pushchair will not have to tilt so far before the line of action of the weight moves outside the base.
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Wh do ten-pin bowling pins have a narrow base and a high centre of gravity?
So they are likely to topple over when hit by a bowling ball.
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**STABIITY IS IMPORTANT IN THE DESIGN OF LOTS OF DIFFERENT OBJECTS. THE STABILITY OF ANY OBJECT IS INCREASED BY MAKING ITS CENTRE OF MASS LOWER AND ITS BASE WIDER**
**LOOK UP DIAGRAM OF TILTING AND TOPPLING AND BALANCED OBJECTS**
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## Other cards in this set

### Card 2

#### Front

When will an object tend to topple over?

#### Back

If the line of action of its weight is outside its base. Also ab object topples over if the resultant moment about its point of turning is not zero.

### Card 3

#### Front

Where does the line of action of the weight of an object act?

### Card 4

#### Front

What happens if the line of action of the weight lies outside the base of an object?

### Card 5

#### Front

The wider the base of an object, and the lower its centre of mass....?